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VLSM and CIDR
CCNA 2- Chapter 6
21
Computer Networking
Undergraduate 1
11/12/2012

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Cards

Term
Refer to the exhibit. A network engineer is summarizing the two groups of routes onrouter R1 shown in the exhibit. Which summarization will work for all the subnets?
Definition
192.168.0.0/21
Term
2. What is a supernet?
Definition
a summarization of classful addresses
Term
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?
Definition
/27
Term
4. 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.)
Definition
255.255.255.224 for Sales

255.255.255.240 for QA
Term
Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the exhibit?
Definition
192.168.4.15/29
Term
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?
Definition
84
Term
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?
Definition
CIDR
Term
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?
Definition
29
Term
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?
Definition
192.1.1.224/28
Term
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?
Definition
The subnets overlap and will be rejected by the router.
Term
11. What does VLSM allow a network administrator to do?
Definition
utilize multiple subnet masks in the same IP address space
Term
Chapter6 thumb Routing Protocols and Concepts Chapter 6 Exam Answers

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?
Definition
24
Term
13. Which of the following are contained in the routing updates of classless routing protocols? (Choose two.)
Definition
32-bit address

subnet mask
Term
14. Which three interior routing protocols support VLSM? (Choose three.)
Definition
OSPF

RIPv2

EIGRP
Term
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?
Definition
255.255.255.252
Term
16. What two advantages does CIDR provide to a network? (Choose two.)
Definition
reduced routing table size

reduced routing update traffic
Term
CCNAAnswersChapter6 thumb Routing Protocols and Concepts Chapter 6 Exam Answers

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?
Definition
192.168.2.130/25
Term
18. 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?
Definition
192.168.32.0 – 192.168.47.0/24
Term
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?
Definition
24
Term
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

What is the likely cause of the failure of the ping from R1 to Host B?
Definition
The default gateway on Host B is not correctly set.
Term
22. Which of the following problems does VLSM help to alleviate?
Definition
the shortage of IP addresses
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