Modules 9 – 12: Optimize, Monitor, and Troubleshoot Networks Exam Answers

Last Updated on December 12, 2020 by Admin

CCNA3 v7 – ENSA – Modules 9 – 12: Optimize, Monitor, and Troubleshoot Networks Exam Answers Full 100% 2020

  1. What is the benefit of deploying Layer 3 QoS marking across an enterprise network?

    • Layer 3 marking can carry QoS information on switches that are not IP aware.
    • Layer 3 marking can be used to carry non-IP traffic.
    • Layer 3 marking can be carried in the 802.1Q fields.
    • Layer 3 marking can carry the QoS information end-to-end.
      Answers Explanation & Hints:

      Marking traffic at Layer 2 or Layer 3 is very important and will affect how traffic is treated in a network using QoS.
      Layer 2 marking of frames can be performed for non-IP traffic.
      Layer 2 marking of frames is the only QoS option available for switches that are not “IP aware.”
      Layer 3 marking will carry the QoS information end-to-end.

  2. What is the function of a QoS trust boundary?

    • A trust boundary identifies the location where traffic cannot be remarked.
    • A trust boundary identifies which devices trust the marking on packets that enter a network.
    • A trust boundary only allows traffic to enter if it has previously been marked.
    • A trust boundary only allows traffic from trusted endpoints to enter the network.
      Answers Explanation & Hints:

      Network traffic is classified and marked as close to the source device as possible. The trust boundary is the location where the QoS markings on a packet are trusted as they enter an enterprise network.

  3. What are two approaches to prevent packet loss due to congestion on an interface? (Choose two.)

    • Prevent bursts of traffic.
    • Drop lower-priority packets.
    • Decrease buffer space.
    • Disable queuing mechanisms.
    • Increase link capacity.
      Answers Explanation & Hints:

      There are three approaches to prevent sensitive traffic from being dropped:Increase link capacity to ease or prevent congestion.
      Guarantee enough bandwidth and increase buffer space to accommodate bursts of traffic from fragile flows.
      Prevent congestion by dropping lower-priority packets before congestion occurs.

  4. What configuration scenario would offer the most protection to SNMP get and set messages?

    • SNMP community strings
    • SNMPv2 for in-band management with read-write community strings
    • SNMPv3 configured with the auth security level
    • SNMPv1 with out-of-band management in a private subnet
      Answers Explanation & Hints:

      SNMPv3 supports authentication and encryption with the auth and priv security levels. SNMPv1 and SNMPv2 do not support authentication or encryption. Using a default community string is not secure because the default string of “public” is well known and would allow anyone with SNMP systems to read device MIBs.

  5. Refer to the exhibit. The network administrator enters these commands into the R1 router:

    R1# copy running-config tftp 
    Address or name of remote host [ ]?

    When the router prompts for an address or remote host name, what IP address should the administrator enter at the prompt?

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 09

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 09

    • 192.168.9.254
    • 192.168.10.1
    • 192.168.10.2
    • 192.168.11.252
    • 192.168.11.254
      Answers Explanation & Hints:

      The requested address is the address of the TFTP server. A TFTP server is an application that can run on a multitude of network devices including a router, server, or even a networked PC.

  6. The command ntp server 10.1.1.1 is issued on a router. What impact does this command have?

    • determines which server to send system log files to
    • identifies the server on which to store backup configurations
    • ensures that all logging will have a time stamp associated with it
    • synchronizes the system clock with the time source with IP address 10.1.1.1
      Answers Explanation & Hints:

      The ntp server ip-address global configuration command configures the NTP server for IOS devices.

  7. As the network administrator you have been asked to implement EtherChannel on the corporate network. What does this configuration consist of?

    • providing redundant links that dynamically block or forward traffic
    • grouping multiple physical ports to increase bandwidth between two switches
    • grouping two devices to share a virtual IP address
    • providing redundant devices to allow traffic to flow in the event of device failure
      Answers Explanation & Hints:

      EtherChannel is utilized on a network to increase speed capabilities by grouping multiple physical ports into one or more logical EtherChannel links between two switches. STP is used to provide redundant links that dynamically block or forward traffic between switches. FHRPs are used to group physical devices to provide traffic flow in the event of failure.

  8. What is a definition of a two-tier LAN network design?

    • access and core layers collapsed into one tier, and the distribution layer on a separate tier
    • access and distribution layers collapsed into one tier, and the core layer on a separate tier
    • distribution and core layers collapsed into one tier, and the access layer on a separate tier
    • access, distribution, and core layers collapsed into one tier, with a separate backbone layer
      Answers Explanation & Hints:

      Maintaining three separate network tiers is not always required or cost-efficient. All network designs require an access layer, but a two-tier design can collapse the distribution and core layers into one layer to serve the needs of a small location with few users.

  9. Match the functions to the corresponding layers. (Not all options are used.)

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 001

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 001

  10. What are two reasons to create a network baseline? (Choose two.)

    • to determine what kind of equipment to implement
    • to evaluate security vulnerabilities in the network
    • to identify future abnormal network behavior
    • to design a network according to a proper model
    • to determine if the network can deliver the required policies
    • to select a routing protocol
      Answers Explanation & Hints:

      A network baseline is created to provide a comparison point, at the time that the network is performing optimally, to whatever changes are implemented in the infrastructure. A baseline helps to keep track of the performance, to track the traffic patterns, and to monitor network behavior.

  11. A computer can access devices on the same network but cannot access devices on other networks. What is the probable cause of this problem?

    • The cable is not connected properly to the NIC.
    • The computer has an invalid IP address.
    • The computer has an incorrect subnet mask.
    • The computer has an invalid default gateway address.
      Answers Explanation & Hints:

      The default gateway is the address of the device a host uses to access the Internet or another network. If the default gateway is missing or incorrect, that host will not be able to communicate outside the local network. Because the host can access other hosts on the local network, the network cable and the other parts of the IP configuration are working.

  12. In which step of gathering symptoms does the network engineer determine if the problem is at the core, distribution, or access layer of the network?

    • Document the symptoms.
    • Determine the symptoms.
    • Gather information.
    • Determine ownership.
    • Narrow the scope.
      Answers Explanation & Hints:

      In the “narrow the scope” step of gathering symptoms, a network engineer will determine if the network problem is at the core, distribution, or access layer of the network. Once this step is complete and the layer is identified, the network engineer can determine which pieces of equipment are the most likely cause.

  13. Voice packets are being received in a continuous stream by an IP phone, but because of network congestion the delay between each packet varies and is causing broken conversations. What term describes the cause of this condition?

    • buffering
    • latency
    • queuing
    • jitter
      Answers Explanation & Hints:

      Jitter is the variation in the latency or delay of received packets. When data is sent, packets are sent in a continuous stream and are spaced evenly apart. Because of network congestion, the delay between each packet can vary instead of remaining constant.

  14. Which queuing algorithm has only a single queue and treats all packets equally?

    • FIFO
    • CBWFQ
    • WFQ
    • LLQ
      Answers Explanation & Hints:

      FIFO queuing sends packets out an interface in the order that they had arrived and does not make a decision about packet priority. All packets are treated equally.

  15. A network administrator is deploying QoS with the ability to provide a special queue for voice traffic so that voice traffic is forwarded before network traffic in other queues. Which queuing method would be the best choice?

    • FIFO
    • WFQ
    • CBWFQ
    • LLQ
      Answers Explanation & Hints:

      Low latency queuing (LLQ) allows delay-sensitive data, such as voice traffic, to be defined in a strict priority queue (PQ) and to always be sent first before any packets in any other queue are forwarded.

  16. What are two characteristics of the best-effort QoS model? (Choose two.)

    • It does not provide a delivery guarantee for packets.
    • It uses a connection-oriented approach with QoS.
    • It treats all network packets in the same way.
    • It allows end hosts to signal their QoS needs to the network.
    • It provides preferential treatment for voice packets.
      Answers Explanation & Hints:

      The best-effort QoS model provides no guarantees and it is commonly used on the Internet. The best-effort QoS model treats all network packets in the same way.

  17. What are two characteristics of voice traffic? (Choose two.)

    • Dropped voice packets are not retransmitted.
    • Voice traffic requires at least 384 kbs of bandwidth.
    • Voice traffic consumes lots of network resources.
    • Voice traffic is unpredictable and inconsistent.
    • Voice traffic latency should not exceed 150 ms.
      Answers Explanation & Hints:

      Voice traffic does not consume a lot of network resources, such as bandwidth. However, it is very sensitive to delay and dropped packets cannot be retransmitted. For good voice quality, the amount of latency should always be less than 150 milliseconds.

  18. Which type of network traffic cannot be managed using congestion avoidance tools?

    • TCP
    • UDP
    • IP
    • ICMP
      Answers Explanation & Hints:

      Queuing and compression techniques can help to reduce and prevent UDP packet loss, but there is no congestion avoidance for User Datagram Protocol (UDP) based traffic.

  19. When QoS is implemented in a converged network, which two factors can be controlled to improve network performance for real-time traffic? (Choose two.)

    • link speed
    • delay
    • packet routing
    • jitter
    • packet addressing
      Answers Explanation & Hints:

      Delay is the latency between a sending and receiving device. Jitter is the variation in the delay of the received packets. Both delay and jitter need to be controlled in order to support real-time voice and video traffic.

  20. Why is QoS an important issue in a converged network that combines voice, video, and data communications?

    • Data communications must be given the first priority.
    • Data communications are sensitive to jitter.
    • Voice and video communications are more sensitive to latency.
    • Legacy equipment is unable to transmit voice and video without QoS.
      Answers Explanation & Hints:

      Without any QoS mechanisms in place, time-sensitive packets, such as voice and video, will be dropped with the same frequency as email and web browsing traffic.

  21. A network administrator configures a router with the command sequence:

    R1(config)# boot system tftp://c1900-universalk9-mz.SPA.152-4.M3.bin 
    R1(config)# boot system rom

    What is the effect of the command sequence?

    • On next reboot, the router will load the IOS image from ROM.
    • The router will copy the IOS image from the TFTP server and then reboot the system.
    • The router will load IOS from the TFTP server. If the image fails to load, it will load the IOS image from ROM.
    • The router will search and load a valid IOS image in the sequence of flash, TFTP, and ROM.
      Answers Explanation & Hints:

      The boot system command is a global configuration command that allows the user to specify the source for the Cisco IOS Software image to load. In this case, the router is configured to boot from the IOS image that is stored on the TFTP server and will use the ROMmon imagethat is located in the ROM if it fails to locate the TFTP server or fails to load a valid image from the TFTP server.

  22. An administrator wants to replace the configuration file on a Cisco router by loading a new configuration file from a TFTP server. What two things does the administrator need to know before performing this task? (Choose two.)

    • router IP address
    • TFTP server IP address
    • name of the configuration file that is currently stored on the router
    • name of the configuration file that is stored on the TFTP server
    • configuration register value
      Answers Explanation & Hints:

      In order to identify the exact location of the desired configuration file, the IP address of the TFTP server and the name of the configuration file are essential information. Because the file is a new configuration, the name of the current configuration file is not necessary.

  23. Refer to the exhibit. Which of the three Cisco IOS images shown will load into RAM?

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 04

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 04

    • The router selects an image depending on the value of the configuration register.
    • The router selects the third Cisco IOS image because it is the most recent IOS image.
    • The router selects the second Cisco IOS image because it is the smallest IOS image.
    • The router selects an image depending on the boot system command in the configuration.
    • The router selects the third Cisco IOS image because it contains the advipservicesk9 image.
      Answers Explanation & Hints:

      When performing an upgrade or testing different IOS versions, the boot system command is used to select which image is used to boot the Cisco device.

  24. Refer to the exhibit. What two types of devices are connected to R1? (Choose two.)

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 02

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 02

    • router
    • switch
    • repeater
    • hub
    • Source Route Bridge
      Answers Explanation & Hints:

      The capabilities of the devices displayed by the output show them to be a Cisco 2811 series router, Cisco 1941 series router, and a Cisco 2960 switch.

  25. What are three functions provided by the syslog service? (Choose three.)

    • to gather logging information for monitoring and troubleshooting
    • to select the type of logging information that is captured
    • to specify the destinations of captured messages
    • to periodically poll agents for data
    • to provide statistics on packets that are flowing through a Cisco device
    • to provide traffic analysis
      Answers Explanation & Hints:

      There are three primary functions provided by the syslog service:

      1. gathering logging information
      2. selection of the type of information to be logged
      3. selection of the destination of the logged information
  26. What is the function of the MIB element as part of a network management system?

    • to store data about a device
    • to collect data from SNMP agents
    • to change configurations on SNMP agents
    • to send and retrieve network management information
      Answers Explanation & Hints:

      The Management Information Base (MIB) resides on a networking device and stores operational data about the device. The SNMP manager can collect information from SNMP agents. The SNMP agent provides access to the information.

  27. Which statement describes SNMP operation?

    • An NMS periodically polls the SNMP agents that are residing on managed devices by using traps to query the devices for data.​
    • A get request is used by the SNMP agent to query the device for data.​
    • An SNMP agent that resides on a managed device collects information about the device and stores that information remotely in the
    • MIB that is located on the NMS.​
    • A set request is used by the NMS to change configuration variables in the agent device.
      Answers Explanation & Hints:

      An SNMP agent that resides on a managed device collects and stores information about the device and its operation. This information is stored by the agent locally in the MIB. An NMS periodically polls the SNMP agents that are residing on managed devices by using the get request to query the devices for data.

  28. Refer to the exhibit. A network administrator issues the show lldp neighbors command on a switch. What are two conclusions that can be drawn? (Choose two.)

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 08

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 08

    • Dev2 is a switch.
    • S1 has only two interfaces.
    • Dev1 is a switch with mixed types of interfaces.
    • Dev1 is connected to interface Fa0/5 of S1.
    • Dev1 is connected to interface Fa0/4 of Dev2.
      Answers Explanation & Hints:

      In the output from the show lldp command, under Capability, R indicates a router and B indicates a bridge (switch). Nothing indicates that Dev1 and Dev2 are connected to one another.

  29. What are the three layers of the switch hierarchical design model? (Choose three.)

    • access
    • data link
    • core
    • network access
    • enterprise
    • distribution
      Answers Explanation & Hints:

      The access layer is the lowest layer and it provides network access to users. The distribution layer has many functions, but it aggregates data from the access layer, provides filtering, policy control, and sets Layer 3 routing boundaries. The core layer provides high speed connectivity.

  30. Match the borderless switched network guideline description to the principle. (Not all options are used.)

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 002

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 002

  31. What network design would contain the scope of disruptions on a network should a failure occur?

    • the installation of only enterprise class equipment throughout the network
    • the configuration of all access layer devices to share a single gateway
    • the reduction in the number of redundant devices and connections in the network core
    • the deployment of distribution layer switches in pairs and the division of access layer switch connections between them
      Answers Explanation & Hints:

      One way to contain the impact of a failure on the network is to implement redundancy. One way this is accomplished is by deploying redundant distribution layer switches and dividing the access layer switch connections between the redundant distribution layer switches. This creates what is called a switch block. Failures in a switch block are contained to that block and do not bring down the whole network.

  32. Which action should be taken when planning for redundancy on a hierarchical network design?

    • immediately replace a non-functioning module, service or device on a network
    • continually purchase backup equipment for the network
    • implement STP portfast between the switches on the network
    • add alternate physical paths for data to traverse the network
      Answers Explanation & Hints:

      One method of implementing redundancy is path redundancy, installing alternate physical paths for data to traverse the network. Redundant links in a switched network supports high availability and can be used for load balancing, reducing congestion on the network.

  33. Refer to the exhibit. Which devices exist in the failure domain when switch S3 loses power?

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 07

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 07

    • S4 and PC_2
    • PC_3 and AP_2
    • AP_2 and AP_1
    • PC_3 and PC_2
    • S1 and S4
      Answers Explanation & Hints:

      A failure domain is the area of a network that is impacted when a critical device such as switch S3 has a failure or experiences problems.

  34. What are two benefits of extending access layer connectivity to users through a wireless medium? (Choose two.)

    • increased flexibility
    • decreased number of critical points of failure
    • reduced costs
    • increased bandwidth availability
    • increased network management options
      Answers Explanation & Hints:

      Wireless connectivity at the access layer provides increased flexibility, reduced costs, and the ability to grow and adapt to changing business requirements. Utilizing wireless routers and access points can provide an increase in the number of central points of failure. Wireless routers and access points will not provide an increase in bandwidth availability.

  35. A network designer is considering whether to implement a switch block on the company network. What is the primary advantage of deploying a switch block?

    • A single core router provides all the routing between VLANs.
    • The failure of a switch block will not impact all end users.
    • This is a security feature that is available on all new Catalyst switches.
    • This is network application software that prevents the failure of a single network device.
      Answers Explanation & Hints:

      The configuration of a switch block provides redundancy so that the failure of a single network device generally has little or no effect on end users.

  36. What is a basic function of the Cisco Borderless Architecture access layer?

    • aggregates Layer 2 broadcast domains
    • aggregates Layer 3 routing boundaries
    • provides access to the user
    • provides fault isolation
      Answers Explanation & Hints:

      A function of the Cisco Borderless Architecture access layer is providing network access to the users. Layer 2 broadcast domain aggregation, Layer 3 routing boundaries aggregation, and high availability are distribution layer functions. The core layer provides fault isolation and high-speed backbone connectivity.

  37. Which characteristic would most influence a network design engineer to select a multilayer switch over a Layer 2 switch?

    • ability to build a routing table
    • ability to aggregate multiple ports for maximum data throughput
    • ability to provide power to directly-attached devices and the switch itself
    • ability to have multiple forwarding paths through the switched network based on VLAN number(s)
      Answers Explanation & Hints:

      Multilayer switches, also known as Layer 3 switches, can route and build a routing table. This capability is required in a multi-VLAN network and would influence the network designer to select a multilayer switch. The other options are features also available on Layer 2 switches, so they would not influence the decision to select a multilayer switch.

  38. Refer to the exhibit. Why are routers R1 and R2 not able to establish an OSPF adjacency?​

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 05

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 05

    • The router ID values are not the same in both routers.
    • The serial interfaces are not in the same area.
    • The process numbers are not the same in both routers.
    • A backbone router cannot establish an adjacency with an ABR router.
      Answers Explanation & Hints:

      On router R1, the network 192.168.10.0/30 is defined in the wrong area (area 1). It has to be defined in area 0 in order to establish adjacency with router R2, which has the network 192.168.10.0/30 defined in area 0.

  39. When is the most appropriate time to measure network operations to establish a network performance baseline?

    • at random times during a 10 week period, so that abnormal traffic levels can be detected
    • during quiet vacation periods, so that the level of non-data traffic can be determined
    • whenever high network use is detected, so that how the network performs under stress can be monitored
    • at the same time each day across a set period of average working days, so that typical traffic patterns can be established
      Answers Explanation & Hints:

      The purpose of establishing a network performance baseline is to provide a reference of normal or average network use to enable data traffic anomalies to be detected and then investigated. Network operations that are not average, or are not normal, cannot be used to establish a network performance baseline.

  40. What is the principle that is applied when a network technician is troubleshooting a network fault by using the divide-and-conquer method?

    • Testing is performed at all layers of the OSI model until a non-functioning component is found.
    • Once it is verified that a component in a particular layer is functioning properly, testing can then be performed on any other layer.
    • Testing is performed at Layer 7 and at Layer 1, then at Layers 6 and 2, and so on, working towards the middle of the stack until all layers are verified as operational.
    • Once it is verified that components in a particular layer are functioning properly, it can then be assumed that components in the layers below it are also functional.
      Answers Explanation & Hints:

      The nature of the OSI and TCP/IP layered models is that upper layers are dependent on lower layers. So when troubleshooting, if a particular layer is found to be working correctly then it can be assumed that all layers below it are also functioning correctly.

  41. Refer to the exhibit. A user has configured a NIC on the PC as shown but finds that the PC is unable to access the Internet. What is the problem?

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 01

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 01

    • The preferred DNS address is incorrect.
    • There should not be an alternate DNS server.
    • The settings were not validated upon exit.
    • The default gateway address is incorrect.
      Answers Explanation & Hints:

      In order for a computer to communicate outside its network, it must have a valid default gateway configured.This address cannot be the same as the IP address of the computer.

  42. Which troubleshooting tool would a network administrator use to check the Layer 2 header of frames that are leaving a particular host?

    • protocol analyzer
    • baselining tool
    • knowledge base
    • CiscoView
      Answers Explanation & Hints:

      A protocol analyzer such as Wireshark is capable of displaying the headers of data at any OSI Layer.

  43. Refer to the exhibit. A network engineer configured an ACL preventing Telnet and HTTP access to the HQ web server from guest users in the Branch LAN. The address of the web server is 192.168.1.10 and all guest users are assigned addresses in the 192.168.10.0/24 network. After implementing the ACL, no one can access any of the HQ servers. What is the problem?

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 06

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 06

    • Inbound ACLs must be routed before they are processed.
    • The ACL is implicitly denying access to all the servers.
    • Named ACLs require the use of port numbers.
    • The ACL is applied to the interface using the wrong direction.
      Answers Explanation & Hints:

      Both named and numbered ACLs have an implicit deny ACE at the end of the list. This implicit deny blocks all traffic.

  44. Refer to the exhibit. A network administrator has configured OSPFv2 on the two Cisco routers as shown. PC1 is unable to connect to PC2. What should the administrator do first when troubleshooting the OSPFv2 implementation?

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 10

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 10

    • Test Layer 3 connectivity between the directly connected routers.
    • Turn off OSPFv2.
    • Disconnect the serial link between router R1 and R2.
    • Implement the network 192.168.255.0 0.0.0.3 area 0 command on router R1.
      Answers Explanation & Hints:

      A prerequisite for OSPFv2 neighbor relationships to form between two routers is Layer 3 connectivity. A successful ping confirms that a router interface is active and may be able to form an OSPF neighbor adjacency.

  45. A user is unable to reach the website when typing http://www.cisco.com in a web browser, but can reach the same site by typing http://72.163.4.161 . What is the issue?

    • default gateway
    • DHCP
    • DNS
    • TCP/IP protocol stack
      Answers Explanation & Hints:

      Domain Name Service (DNS) is used to translate a web address to an IP address. The address of the DNS server is provided via DHCP to host computers.​

  46. Refer to the exhibit. R1 and R3 are connected to each other via the local serial 0/0/0 interface. Why are they not forming an adjacency?

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 03

    CCNA3 v7 – ENSA – Modules 9 – 12 Optimize, Monitor, and Troubleshoot Networks Exam Answers 03

    • They are in different subnets.
    • They have different routing processes.
    • They have different router IDs.
    • The connecting interfaces are configured as passive.
      Answers Explanation & Hints:

      The routers need to be in the same subnet in order to form an adjacency. The routing processes can be different on each router. The router IDs must be different for routers that participate in the same routing domain. The interfaces are not passive.

  47. What type of traffic is described as consisting of traffic that gets a lower priority if it is not mission-critical?

    • data
    • video
    • voice
  48. What type of traffic is described as predictable and smooth?

    • voice
    • video
    • data
  49. What type of traffic is described as not resilient to loss?

    • video
    • voice
    • data
  50. What type of traffic is described as being able to tolerate a certain amount of latency, jitter, and loss without any noticeable effects?

    • voice
    • video
    • data
  51. What type of traffic is described as having a high volume of data per packet?

    • video
    • data
    • voice
  52. What type of traffic is described as consisting of traffic that requires a higher priority if interactive?

    • data
    • video
    • voice
  53. What type of traffic is described as requiring latency to be no more than 150 milliseconds (ms)?

    • voice
    • data
    • video
  54. What type of traffic is described as requiring latency to be no more than 400 milliseconds (ms)?

    • video
    • data
    • voice
  55. What type of traffic is described as tending to be unpredictable, inconsistent, and bursty?

    • video
    • voice
    • data
  56. What type of traffic is described as traffic that requires at least 30 Kbps of bandwidth?

    • voice
    • video
    • data
  57. A network manager wants to add a time to log messages so that there is record of when the message was generated. What command should the administrator use on a Cisco router?

    • service timestamps log datetime
    • show cdp interface
    • ntp server 10.10.14.9
    • clock timezone PST -7
  58. A network manager wants to add a time to log messages so that there is record of when the message was generated. What command should the administrator use on a Cisco router?

    • service timestamps log datetime
    • show cdp interface
    • ntp server 10.10.14.9
    • copy running-config tftp
  59. A network manager wants to backup the running configuration to a file server. What command should the administrator use on a Cisco router?

    • copy running-config tftp
    • dir
    • show file systems
    • cd usbflash0:
  60. A network manager wants lists the contents of flash. What command should the administrator use on a Cisco router?

    • dir
    • lldp enable
    • service timestamps log datetime
    • show file systems
  61. A network manager wants to ensure that the device will ignore the startup config file during startup and bypass the required passwords. What command should the administrator use on a Cisco router?

    • confreg 0x2142
    • copy usbflash0:/R1-Config
    • copy running-config tftp
    • config-register 0x2102
  62. A network manager wants to configure the router to load a new image from flash during bootup. What command should the administrator use on a Cisco router?

    • boot system
    • clock set 14:25:00 nov 13 2018
    • copy tftp startup-config
    • copy flash: tftp:
  63. A network manager wants to determine the size of the Cisco IOS image file on the networking device. What command should the administrator use on a Cisco router?

    • show flash:0
    • copy flash: tftp:
    • config-register 0x2102
    • confreg 0x2142
  64. A network manager wants to determine the size of the Cisco IOS image file on the networking device. What command should the administrator use on a Cisco router?

    • show flash:0
    • clock timezone PST -7
    • lldp enable
    • ntp server 10.10.14.9
  65. A network manager wants to view the amount of available and free memory, the type of file system, and its permissions. What command should the administrator use on a Cisco router?

    • show file systems
    • clock timezone PST -7
    • lldp enable
    • ntp server 10.10.14.9
  66. A network manager wants to view the amount of available and free memory, the type of file system, and its permissions. What command should the administrator use on a Cisco router?

    • show file systems
    • clock timezone PST -7
    • copy usbflash0:/R1-Config
    • copy running-config tftp