Routing Protocols exam Chapter 1

1

Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.) Correct Response Your Response Administrative distance refers to the trustworthiness of a particular route. A router first installs routes with higher administrative distances. The value of the administrative distance can not be altered by the network administrator. Routes with the smallest metric to a destination indicate the best path. The metric is always determined based on hop count. The metric varies depending which Layer 3 protocol is being routed, such as IP.

This item references content from the following areas: Routing Protocols 1.2.2 Path Determination

4

Refer to the exhibit. A network administrator has configured R1 as shown. When the administrator checks the status of the serial interface, the interface is shown as being administratively down. What additional command must be entered on the serial interface of R1 to bring the interface up? Correct Response Your Response IPv6 enable clockrate 128000 end no shutdown By default all router interfaces are shut down. To bring the interfaces up, an administrator must issue the no shutdown command in interface mode.

This item references content from the following areas: Routing Protocols 1.1.3 Basic Settings on a Router

5

What is one feature that distinguishes routers from Layer 2 switches? Correct Response Your Response Routers can be configured with IP addresses. Switches cannot. Switches move packets from one physical interface to another. Routers do not. Switches use tables of information to determine how to process data traffic. Routers do not. Routers support a variety of interface types. Switches typically support Ethernet interfaces. Routers can support a variety of interfaces for connecting to WANs, such as serial, DSL, and wireless. Switches typically connect to LANs and only support Ethernet standards, such as Fast Ethernet or Gigabit Ethernet. Both routers and switches can be configured with IP addresses and can move packets from one interface to another. They also both use tables of data, such as routing tables and MAC address tables, to determine how to process data traffic.

This item references content from the following areas: Routing Protocols 1.1.3 Basic Settings on a Router

6

Which command is used to configure an IPv6 address on a router interface so that the router will combine a manually specified network prefix with an automatically generated interface identifier? Correct Response Your Response ipv6 enable ipv6 address ipv6-address/prefix-length ipv6 address ipv6-address/prefix-length eui-64 ipv6 address ipv6-address/prefix-length link-local The eui-64 parameter in the ipv6 address command specifies that the router should combine the configured network prefix with an automatically generated interface identifier. The link-local parameter tells the router to use this address as a link-local address rather than the automatically derived link-local address. Using the command ipv6 enable instructs the router to use router advertisements to automatically determine both the network prefix and the interface identifier.

This item references content from the following areas: Routing Protocols 1.1.3 Basic Settings on a Router

7	What type of IPv6 address is required as a minimum on IPv6 enabled interfaces? Correct Response Your Response loopback unique local link-local static global unicast All IPv6 enabled interfaces must have a link-local IPv6 address. This address can be statically configured or dynamically configured.

This item references content from the following areas: Routing Protocols 1.1.4 Verify Connectivity of Directly Connected Networks

8

What two pieces of information are displayed in the output of the show ip interface briefcommand? (Choose two.) Correct Response Your Response IP addresses MAC addresses Layer 1 statuses next-hop addresses interface descriptions speed and duplex settings The command show ip interface brief shows the IP address of each interface, as well as the operational status of the interfaces at both Layer 1 and Layer 2. In order to see interface descriptions and speed and duplex settings, use the command show running-config interface. Next-hop addresses are displayed in the routing table with the command show ip route, and the MAC address of an interface can be seen with the command show interfaces.

This item references content from the following areas: Routing Protocols 1.1.4 Verify Connectivity of Directly Connected Networks

17

Refer to the exhibit. A network administrator issues the show ipv6 route command on R1. What two conclusions can be drawn from the routing table? (Choose two.) Correct Response Your Response R1 does not know a route to any remote networks. The network FF00::/8 is installed through a static route command. The interface Fa0/1 is configured with IPv6 address 2001:DB8:ACAD:A::12. Packets that are destined for the network 2001:DB8:ACAD:2::/64 will be forwarded through Fa0/1. Packets that are destined for the network 2001:DB8:ACAD:2::54/128 will be forwarded through Fa0/0. From the routing table, R1 knows two directly connected networks and the multicast network (FF00::/8). It does not know any routes to remote networks. The entry 2001:DB8:ACAD:A::12/128 is the local host interface route.

This item references content from the following areas: Routing Protocols 1.3.2 Directly Connected Routes

19

A network administrator configures a router by the command ip route 0.0.0.0 0.0.0.0 209.165.200.226. What is the purpose of this command? Correct Response Your Response to forward all packets to the device with IP address 209.165.200.226 to add a dynamic route for the destination network 0.0.0.0 to the routing table to forward packets destined for the network 0.0.0.0 to the device with IP address 209.165.200.226 to provide a route to forward packets for which there is no route in the routing table The command ip route 0.0.0.0 0.0.0.0 <next hop> adds a default route to the routing table of a router. When the router receives a packet and does not have a specific route toward the destination, it forwards the packet to the next hop indicated in the default route. A route created with the ip route command is a static route, not a dynamic route.

This item references content from the following areas: Routing Protocols 1.3.3 Statically Learned Routes

21

A network administrator is implementing dynamic routing protocols for a company. Which command can the administrator issue on a router to display the supported routing protocols? Correct Response Your Response Router(config)# router ? Router(config)# service ? Router(config)# ip route ? Router(config)# ip forward-protocol ? The command router ? will display the routing protocols supported by a router. The other answers will display the command options for each case.

This item references content from the following areas: Routing Protocols 1.3.4 Dynamic Routing Protocols