CCNA Exploration 4.0: Routing Protocols and Concepts - Chpater 2 Exam Answers

1. Which of the following are displayed by the Router# show cdp neighbors command? (Choose three.)

load
*platform
reliability
*holdtime
*local interface

2. Why is it advisable to enter a next-hop IP address when creating a static route whose exit interface is an Ethernet network?

*Adding the next-hop address eliminates the need for the router to do any lookups in the routing table before forwarding a packet.
In a multi-access network, the router cannot determine the next-hop MAC address for the Ethernet frame without a next-hop address.
Using a next-hop address in a static route provides a route with a lower metric.
In multi-access networks, using a next-hop address in a static route makes that route a candidate default route.

3. The output of the Router# show interfaces serial 0/1 command displays the following:

Serial0/1 is up, line protocol is down.
What is the most likely cause for the line protocol being down?
*Serial0/1 is shutdown.
There is no cable connecting the routers.
The remote router is using serial 0/0.
No clock rate has been set.

4. A static route that points to the next hop IP will have what administrative distance and metric in the routing table?

administrative distance of 0 and metric of 0
*administrative distance of 0 and metric of 1
administrative distance of 1 and metric of 0
administrative distance of 1 and metric of 1

5. Refer to the exhibit. What two commands will change the next-hop address for the 10.0.0.0/8 network from 172.16.40.2 to 192.168.1.2? (Choose two.)

A(config)# no network 10.0.0.0 255.0.0.0 172.16.40.2
*A(config)# no ip address 10.0.0.1 255.0.0.0 172.16.40.2
A(config)# no ip route 10.0.0.0 255.0.0.0 172.16.40.2
*A(config)# ip route 10.0.0.0 255.0.0.0 s0/0/0
A(config)# ip route 10.0.0.0 255.0.0.0 192.168.1.2



6. Refer to the exhibit. A company network engineer is assigned to establish connectivity between the two Ethernet networks so that hosts on the 10.1.1.0/24 subnet can contact hosts on the 10.1.2.0/24 subnet. The engineer has been told to use only static routing for these company routers. Which set of commands will establish connectivity between the two Ethernet networks?

R1(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1R2(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2
*R1(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.1
R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1
R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.1R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.2
R1(config)# ip route 0.0.0.0 0.0.0.0 10.1.2.1R2(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1

7. Refer to the exhibit. Which static route should be configured on Router1 so that host A will be able to reach host B on the 172.16.0.0 network?

ip route 192.168.0.0 172.16.0.0 255.255.0.0
*ip route 172.16.0.0 255.255.0.0 192.168.0.1
ip route 172.16.0.0 255.255.0.0 S0/0/1
ip route 172.16.0.0 255.255.0.0 S0/0/0

8. What address can be used to summarize networks 172.16.1.0/24, 172.16.2.0/24, 172.16.3.0/24, and 172.16.4.0/24?

172.16.0.0/21
172.16.1.0/22
*172.16.0.0 255.255.255.248
172.16.0.0 255.255.252.0

9. Refer to the exhibit. What is the significance of the /8 in the route to the 10.0.0.0 network?

It indicates that there are 8 hops between this router and the 10.0.0.0 network.
It represents the time, in milliseconds, it takes for a ping to reply when sent to the 10.0.0.0 network.
*It indicates that there are 8 subnets in the destination network to which the router can forward packets.
It indicates the number of consecutive bits, from the left, in the destination IP address of a packet that must match 10.0.0.0 to use that route.

10. What two devices are responsible for converting the data from the WAN service provider into a form acceptable by the router? (Choose two).

*the serial port of the router
a modem
a switch the ethernet port of the router
a CSU/DSU device
*a DTE device

11. A network administrator enters the following command into Router1: ip route 192.168.0.0 255.255.255.0 S0/1/0. Router1 then receives a packet that is destined for 192.168.0.22/24. After finding the recently configured static route in the routing table, what does Router1 do next to process the packet?

drops the packet because the destination host is not listed in the routing table
*looks up the MAC address of the S0/1/0 interface to determine the destination MAC address of the new frame
performs a recursive lookup for the IP address of the S0/1/0 interface before forwarding the packet
encapsulates the packet into a frame for the WAN link and forwards the packet out the S0/1/0 interface

12. Which piece of information is available from examining the output of the command show ip interface brief?

*Interface speed and duplex
Interface MTU
Errors
Interface MAC address
Interface IP address

13. Which of the following is true regarding CDP and the graphic shown?

*CDP running on Router D will gather information about routers A, B, C, and E.
By default, Router A will receive CDP advertisements from routers B and C.
If routers D and E are running different routing protocols, they will not exchange CDP information.
Router E can use CDP to identify the IOS running on Router B.

14. Which two statements describe functions or characteristics of CDP? (Choose two.)

It starts up automatically and allows the device to detect directly connected neighbor devices that use CDP.
*It operates at the network layer and allows two systems to learn about each other.
It creates a topology map of the entire network.
It allows systems to learn about each other even if different network layer protocols are configured.
*It forwards advertisements about routes for faster convergence.

15. Hosts on two separate subnets cannot communicate. The network administrator suspects a missing route in one of the routing tables. Which three commands can be used to help troubleshoot Layer 3 connectivity issues? (Choose three.)

ping
*show arp
traceroute
show ip route
*show interface
*show cdp neighbor detail

16. What happens to a static route entry in a routing table when the outgoing interface is not available?

The route is removed from the table.
The router polls neighbors for a replacement route.
*The route remains in the table because it was defined as static.
The router redirects the static route to compensate for the loss of the next hop device.

17. The routers in the diagram use the subnet assignments shown. What is the most efficient route summary that can be configured on Router3 to advertise the internal networks to the cloud?

192.1.1.0/26 and 192.1.1.64/27
192.1.1.128/25
*192.1.1.0/23 and 192.1.1.64/23
192.1.1.0/24
192.1.1.0/25
192.1.1.0/24 and 192.1.1.64/24

18. Refer to the exhibit. How will packets destined to the 172.16.0.0 network be forwarded?

Router1 will perform recursive lookup and packet will exit S0/0.
Router1 will perform recursive lookup and packet will exit S0/1.
*There is no matching interface associated with network 172.16.0.0 so packets will be dropped.
There is no matching interface associated with network 172.16.0.0 so packets will take gateway of last resort and exit out S0/2.

19. A router has one static route to each destination network. Which two scenarios would require an administrator to alter the static routes that are configured on that router? (Choose two.)

The destination network no longer exists.
The destination network is moved to a different interface on the same router.
*The path between the source and destination is upgraded with a higher bandwidth link.
A topology change occurs where the existing next-hop address or exit interface is not accessible.
*The remote destination network interface has to be down for 15 minutes of maintenance.

20. Refer to the exhibit. Given the output in the exhibit, how would a clock rate be determined for this link?

The rate would be negotiated by both routers.
A rate would not be selected due to the DCE/DTE connection mismatch.
*The rate configured on the DTE determines the clock rate.
The rate configured on the DCE determines the clock rate.

21. Refer to the exhibit. Which set of commands will configure static routes that will allow the WinterPark and the Altamonte routers to deliver packets from each LAN and direct all other traffic to the Internet?

WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/1
*WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1
*WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2
WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/0

22. Refer to the exhibit. What two commands are required to provide connectivity between the 192.168.1.0 and 10.0.0.0 networks without requiring recursive lookup? (Choose two.)

A(config)# ip route 10.0.0.0 255.0.0.0 s 0/1/0
*A(config)# ip route 10.0.0.0 255.0.0.0 172.16.40.2
A (config)# ip route 10.0.0.0 255.0.0.0 s 0/0/0
B(config)# ip route 192.168.1.0 255.255.255.0 s 0/0/0
*B (config)# ip route 192.168.1.0 255.255.255.0 172.16.40.1
B(config)# ip route 192.168.1.0 255.255.255.0 s 0/1/0

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