Ccna 2 chapter 6 v4.0 answers 2011

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CCNA 2 Chapter 6 V4.0 Answers
1. What two advantages does CIDR provide to a network? (Choose two.)
reduced routing table size
dynamic address assignment
automatic route redistribution
reduced routing update traffic
automatic summarization at classful boundaries

2.

Refer to the exhibit. Which address is a broadcast address for one of the subnets
that are shown in the exhibit?
192.168.4.3/29

192.168.4.15/29
192.168.4.65/26
192.168.4.255/24

3.

In the network shown in the graphic, three bits were borrowed from the host
portion of a Class C address. How many valid host addresses will be unused on the
three point-to-point links combined if VLSM is not used?


3
4
12
36
84
180

4. Which of the following are contained in the routing updates of classless routing
protocols? (Choose two.)
32-bit address
next hop router interface
subnet mask
unicast host address
Layer 2 address

5.

Refer to the exhibit. The network administrator wants to create a subnet for the
point-to-point connection between the two routers. Which subnetwork mask would
provide enough addresses for the point-to-point link with the least number of
wasted addresses?
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
255.255.255.252

6. What does VLSM allow a network administrator to do?
utilize one subnet mask throughout an autonomous system
utilize multiple subnet masks in the same IP address space
utilize IGRP as the routing protocol in an entire autonomous system
utilize multiple routing protocols within an autonomous system

7. Which three interior routing protocols support VLSM? (Choose three.)
OSPF
RIP v1
RIP v2
EIGRP
BGP
STP


8. Which of the following problems does VLSM help to alleviate?
the shortage of IP addresses
the difficulty of assigning static IP addresses to hosts in large enterprises
the complexity of implementing advanced routing protocols such as OSPF and EIGRP
the shortage of network administrators qualified in the use of RIP v1 and IGRP

9.

Refer to the exhibit. A network technician enters the static route in R1 needed to
reach network 10.1.1.0/24. A ping from the S0/0/0 interface on R1 to host B fails.
The technician begins testing the network and has the following results:
1. pings from R1 to the S0/0/0 interface on R2….successful
2. pings from R1 to the Fa0/0 interface on R2….successful
3. pings from host B to hosts on the 10.1.1.0/24 network….successful
4. pings from host B to the Fa0/0 interface on R2….successful
5. pings from R2 to host B….successful.
What is the likely cause of the failure of the ping from R1 to host B?
The default gateway on host B is not correctly set.
There are no routes back to networks connected to R1 from R2.
There is a Layer 2 problem between R2 and host B.
Host B has a defective Ethernet card.

10. A network administrator is tasked with dividing up a class C network among the
QA, Sales, and Administration departments. The QA department is made up of 10
people, the Sales is made up of 28 people, and the Administration has 6. Which two
subnets masks adequately address the QA and Sales departments? (Choose two.)
255.255.255.252 for QA
• 255.255.255.224 for Sales
• 255.255.255.240 for QA
255.255.255.248 for QA
255.255.255.0 for Sales

11.

Refer to the exhibit. A network engineer is summarizing the two groups of routes on
router R1 shown in the exhibit. Which summarization will work for all the subnets?
192.168.0.0/23
192.168.0.0/22


192.168.0.0/21
192.168.0.0/20

12

A Class C address has been assigned for use in the network shown in the graphic.
Using VLSM, which bit mask should be used to provide for the number of host
addresses required on Router A, while wasting the fewest addresses?
/31
/30
/29
/28
/27
/26

13.

Refer to the exhibit. In the network that is shown, the router interfaces are assigned
the first address in each subnet. Which IP address would be usable for a host on one
of the LANs in this network?
192.168.1.5/30
192.168.2.17/28
192.168.2.63/27
192.168.2.130/25


14.

Refer to the exhibit. What subnet mask will be applied if Router A sends a RIPv1
update for the network 172.16.1.0 to Router B?
none
8
16
24

15.

Refer to the exhibit. The number of required host addresses for each subnet in a
network is listed in the exhibit. This number includes the host address requirements
for all router ports and hosts on that subnet. After all device and router port
address assignments are determined, what will be the total number of unused host
addresses available?
6
14
29
34
40
62

16.

An additional subnet is required for a new Ethernet link between Router1 and
Router2 as shown in the diagram. Which of the following subnet addresses can be


configured in this network to provide a maximum of 14 useable addresses for this
link while wasting the fewest addresses?
192.1.1.16/26
192.1.1.96/28
192.1.1.160/28
192.1.1.196/27
192.1.1.224/28
192.1.1.240/28

17. What is a supernet?
the network for a default route
a summarization of classful addresses
a network that contains both private and public addresses
a set of discontiguous networks that are controlled by an ISP

18.

Refer to the exhibit. A network administrator needs to create two subnetworks from
10.0.0.0/8 for a router running RIPv2. The Admin subnet requires 120 hosts and the
Sales subnet requires 58 hosts. The network administrator assigned 10.0.1.128/25 to
the Admin subnet. The Sales subnet is given 10.0.1.192/26. What will be the result of
this addressing scheme?
Because RIPv2 does not support VLSM, the subnet masks will not be allowed.
The subnets will not have enough host addresses for the given network requirements.
The subnets overlap and will be rejected by the router.
The router will support the addressing scheme.

19. A router has a summary route to network 192.168.32.0/20 installed in its routing
table. What range of networks are summarized by this route?
192.168.0.0 – 192.168.32.0/24
192.168.0.0 – 192.168.47.0/24
192.168.32.0 – 192.168.47.0/24
192.168.32.0 – 192.168.48.0/24
192.168.32.0 – 192.168.63.0/24

20.


Refer to the exhibit. The network administrator wants to minimize the number of
entries in Router1’s routing table. What should the administrator implement on the
network?
VLSM
CIDR
private IP addresses
classful routing

21.

Refer to the exhibit. What subnet mask will be applied by router B when it receives
a RIPv1 update for the network 172.16.1.0?
none
8
16
24

22.


Refer to the exhibit. A network technician enters the static route in R1 needed to
reach network 10.1.1.0/24. A ping from R1 to Host B fails. The technician begins
testing the network and has the following results:
1. pings from R1 to the S0/0/0 interface on R2….successful
2. pings from R1 to the Fa0/0 interface on R2….successful
3. pings from Host B to hosts on the 10.1.1.0/24 network….successful
4. pings from Host B to the Fa0/0 interface on R2….successful
5. pings from R2 to Host B….successful
23. What is the likely cause of the failure of the ping from R1 to Host B?
Host B has a defective Ethernet card.
The default gateway on Host B is not correctly set.
There is a Layer 2 problem between R2 and Host B.
R2 does not have routes back to networks connected to R1.

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Ccna 2 chapter 6 v4.0 answers 2011

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