CCNA 4 Exploration - Chapter 5

CHAPTER 5 - Correct Answers

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1
In an IPv4 environment, what information is used by the router to forward data packets from one interface of a router to another?

--> destination network address

2
What information is added during encapsulation at OSI Layer 3?

--> source and destination IP address


3
In a connectionless system, which of the following is correct?

--> The destination is not contacted before a packet is sent.


4
Which IP packet field will prevent endless loops?

--> *time-to-live


5
Which portion of the network layer address does a router use to forward packets?

--> network portion

6
Refer to the exhibit. Using the network in the exhibit, what would be the default gateway address for host A in the 192.133.219.0 network?

--> 192.133.219.1

7
If the default gateway is configured incorrectly on the host, what is the impact on communications?

--> The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.


8
What is the purpose of a default gateway?

--> identifies the device that allows local network computers to communicate with devices on other networks


9
What type of routing uses information that is manually entered into the routing table?

--> static


10
When the destination network is not listed in the routing table of a Cisco router, what are two possible actions that the router might take? (Choose two.)

--> The router discards the packet.

--> The router forwards the packet out the interface indicated by the default route entry.


11
What are the key factors to consider when grouping hosts into a common network? (Choose three.)

--> purpose

--> geographic location

--> ownership

12
What is a component of a routing table entry?

--> the next-hop address

13
Which intermediary devices could be used to implement security between networks? (Choose two.)

--> router

--> firewall


14
What are three common problems with a large network? (Choose three.)


--> Performance degradation

--> security issues

--> host identification


15
Refer to the exhibit. All devices shown in the exhibit have factory default settings. How many broadcast domains are represented in the topology that is shown?

--> 4


16
Which three statements are true about routes and their use? (Choose three.)

--> If the destination network is directly connected, the router forwards the packet to the destination host.

--> If no route exists for the destination network and a default route is present, the packet is forwarded to the next-hop router.

--> If the originating host has a default gateway configured, the packet for a remote network can be forwarded using that route.


17
Refer to the exhibit. A network administrator is troubleshooting a connectivity problem and needs to determine the address that is used to forward network packets out the network. Using the netstat -r command, the administrator would identify which address as the address to which all hosts send packets that are destined for an outside network?

--> 10.10.10.6

18
Refer to the exhibit. A network administrator notices that there are too many broadcasts on the network. What two steps can the network administrator take to resolve this problem? (Choose two.)

--> Replace S2 with a router.

-->Subnet the 192.168.0.0 /24 network.


19
Refer to the exhibit. The network in the exhibit is fully operational. What two statements correctly describe the routing for the topology that is shown? (Choose two.)

--> 192.168.0.2 is the next-hop address that is used by R3 to route a packet from the 10.0.0.0 network to the 172.16.0.0 network.

--> 192.168.0.1 is the next-hop address that is used by R2 to route a packet from the 172.16.0.0 network to the 192.168.12.0 network.

20
What two characteristics are commonly associated with dynamic routing protocols? (Choose two.)

--> provide routers with up-to-date routing tables

--> consume bandwidth to exchange route information


21
What statement describes the purpose of a default route?

--> A host uses a default route to transfer data to a host outside the local network when no other route to the destination exists.