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Cisco Networking Academy's Introduction to Routing Concepts

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: Mar 20, 2014.

Chapter Description

This chapter introduces and explains the primary functions and features of a router and explains the process for connecting and configuring devices to the router. It continues by describing the process by which routers manage packets, determine data paths, and build routing tables.

Check Your Understanding Questions

Complete all the review questions listed here to test your understanding of the topics and concepts in this chapter. The appendix, “Answers to the ‘Check Your Understanding’ Questions,” lists the answers.

  1. Which of the following matches a router component with its function?

    1. Flash: Permanently stores the bootstrap program
    2. ROM: Permanently stores the startup configuration file
    3. NVRAM: Permanently stores the operating system image
    4. RAM: Stores the routing tables and ARP cache
  2. Which command can a technician use to determine whether router serial ports have IP addresses that are assigned to them?

    1. show interfaces ip brief
    2. show controllers all
    3. show ip config
    4. show ip interface brief
  3. Which of the following commands will set and automatically encrypt the privileged EXEC mode password to “quiz”?

    1. R1(config)# enable secret quiz
    2. R1(config)# password secret quiz
    3. R1(config)# enable password secret quiz
    4. R1(config)# enable secret password quiz
  4. Which routing principle is correct?

    1. If one router has certain information in its routing table, all adjacent routers have the same information.
    2. Routing information about a path from one network to another implies routing information about the reverse, or return, path.
    3. Every router makes its routing decisions alone, based on the information it has in its own routing table.
    4. Every router makes its routing decisions based on the information it has in its own routing table and the information in its neighbor routing tables.
  5. What two tasks do dynamic routing protocols perform? (Choose two.)

    1. Discover hosts
    2. Update and maintain routing tables
    3. Propagate host default gateways
    4. Network discovery
    5. Assign IP addressing
  6. A network engineer is configuring a new router. The interfaces have been configured with IP addresses and activated, but no routing protocols or static routes have been configured yet. What routes are present in the routing table?

    1. Default routes
    2. Remote network routes
    3. Directly connected routes
    4. No route as the routing table is empty
  7. Which statements are correct regarding how a router forwards packets? (Choose two.)

    1. If the packet is destined for a remote network, the router forwards the packet out all interfaces that might be a next hop to that network.
    2. If the packet is destined for a directly connected network, the router forwards the packet out the exit interface indicated by the routing table.
    3. If the packet is destined for a remote network, the router forwards the packet based on the information in the router host table.
    4. If the packet is destined for a remote network, the router sends the packet to the next-hop IP address in the routing table.
    5. If the packet is destined for a directly connected network, the router forwards the packet based on the destination MAC address.
    6. If the packet is destined for a directly connected network, the router forwards the packet to the switch on the next-hop VLAN.
  8. Which command is used to explicitly configure a local IPv6 address on a router interface?

    1. ipv6 enable
    2. ipv6 address ipv6-address/prefix-length
    3. ipv6 address ipv6-address/prefix-length eui-64
    4. ipv6 address ipv6-address/prefix-length link-local
  9. Which statement is true regarding metrics used by routing protocols?

    1. A metric is the quantitative value that a routing protocol uses to measure a given route.
    2. A metric is a Cisco-proprietary means to convert distances to a standard unit.
    3. Metrics represent a composite value of the amount of packet loss occurring for all routing protocols.
    4. Metrics are used by the router to determine whether a packet has an error and should be dropped.
  10. The network administrator configured the ip route serial 0/0/0 command on the router. How will this command appear in the routing table, assuming that the Serial 0/0/0 interface is up?

    1. D is directly connected, Serial0/0/0
    2. S* is directly connected, Serial0/0/0
    3. S* [1/0] via
    4. C [1/0] via
  11. How many equal-cost paths can a dynamic routing protocol use for load balancing by default?

    1. 2
    2. 3
    3. 4
    4. 6
  12. What two statements correctly describe the concepts of administrative distance and metric? (Choose two.)

    1. Administrative distance refers to the trustworthiness of a particular route.
    2. A router first installs routes with higher administrative distances in its routing table.
    3. Routes with the smallest metric to the destination indicate the best path.
    4. Metrics are used by the router to determine whether a packet has an error and should be dropped.
    5. The metric is always determined based on hop count.
  13. When a packet travels from router to router to its destination, what address continually changes from hop to hop?

    1. Source and destination Layer 2 address
    2. Source Layer 3 address
    3. Destination Layer 3 address
    4. Destination port
  14. Describe the internal router hardware components, and outline the purpose of each.
  15. Describe the router bootup process from power on to final configuration.
  16. What are two important functions that a router performs?
  17. Describe the steps necessary to configure basic settings on a router.
  18. Describe the importance of the routing table. What purposes does it serve?
  19. What are the three basic ways a router learns about networks?
  20. What three pieces of information must be configured on a host to forward packets to remote networks? (Choose three.)

    1. Clock rate
    2. Default gateway
    3. DHCP server address hostname
    4. DNS server address
    5. IP address
    6. Subnet mask
  21. A serial interface has been configured with an IP address and the clock rate. However, the show ip interface brief command indicates that the interface is administratively down. What must be done to correct the problem?
  22. What type of IPv6 address must be configured on an IPv6-enabled interface?
  23. When a computer is pinging another computer for the first time, which type of message does it send first to determine the MAC address of the other device?

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