DRSEnt Chapter 4 – CCNA Discovery: Introducing Routing and Switching in the Enterprise

(Version 4.0)

1. What are two benefits of implementing a VLSM addressing scheme? (Choose two.)

allows efficient use of address space

supports hierarchical addressing capability

supports only one subnet mask length throughout the entire network

allows efficient use of larger routing tables to eliminate the need for route summarization

solves the problem of discontiguous networks with classful routing protocols

 

2. When running NAT, what is the purpose of address overloading?

limit the number of hosts that can connect to the WAN

allow multiple inside addresses to share a single global address

force hosts to wait for an available address

allow an outside host to share inside global addresses

 

3. Which two IP addresses represent the network and broadcast addresses for the

network that includes host 192.168.100.130/27? (Choose two.)

network 192.168.100.0

network 192.168.100.128

network 192.168.100.130

broadcast 192.168.100.157

broadcast 192.168.100.159

broadcast 192.168.100.255

 

4. 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

 

5. What range of networks are summarized by the address and mask, 192.168.32.0/19?

192.168.0.0/24 – 192.168.32.0/24

192.168.0.0/24 – 192.168.31.0/24

192.168.32.0/24 – 192.168.64.0/24

192.168.32.0/24 – 192.168.63.0/24

 

6. What is a characteristic of a classful routing protocol on the network?

All subnets are seen by all routers.

CIDR addresses are advertised.

A subnet can be further subnetted down and advertised correctly.

Updates received by a router in a different major network have the default mask applied.

 

7. A network administrator is asked to design a new addressing scheme for a corporate

network. Presently, there are 500 users at the head office, 200 users at sales, 425 at

manufacturing, and 50 at the research site. Which statement defines the correct VLSM

addressing map with minimal waste using the 172.16.0.0/16 network?

172.16.0.0/20 head office 

172.16.1.0/21 manufacturing 

172.16.1.0/22 sales 

172.16.3.0/26 research

172.16.48.0/19 head office 

172.16.16.0/20 manufacturing 

172.16.48.128 sales 

172.16.48.0/26 research

172.16.0.0/23 head office 

172.16.2.0/23 manufacturing 

172.16.4.0/24 sales 

172.16.5.0/26 research

172.16.2.0/22 head office 

172.16.3.0/23 manufacturing 

172.16.4.0/26 sales 

172.16.4.128/25 research

 

8.

Refer to the exhibit. Which two are valid VLSM network addresses for the serial link

between Router1 and Router2? (Choose two.)

192.168.1.4/30

192.168.1.8/30

192.168.1.90/30

192.168.1.101/30

192.168.1.190/30

 

9.

Refer to the exhibit. Based on the output of the show ip nat translationscommand,

which kind of address translation is in effect on this router?

static

public

overload

private

 

10. A network engineer is implementing a network design using VLSM for network

192.168.1.0/24. After subnetting the network, the engineer has decided to take one of

the subnets, 192.168.1.16/28 and subnet it further to provide for point-to-point serial link

addresses. What is the maximum number of subnets that can be created from the

192.168.1.16/28 subnet for serial connections?

1

2

4

6

8

16

 

11. How many addresses will be available for dynamic NAT translation when a router is

configured with the following commands? 

Router(config)#ip nat pool TAME 209.165.201.23 209.165.201.30 netmask

255.255.255.224 

Router(config)#ip nat inside source list 9 pool TAME

7

8

9

10

24

31

 

12.

Refer to the exhibit. All networks that are shown have a /24 prefix. Assuming that all

routes have been discovered by all routers in the network, which address will

successfully summarize only the networks that are shown?

192.168.8.0/21

192.168.8.0/24

192.168.16.0/20

192.168.16.0/21

192.168.16.0/24

 

13. What two pieces of information can be determined from the host IP address of

192.168.2.93/29? (Choose two.)

The number of bits borrowed for the subnetwork is 5.

The number of usable hosts for each subnetwork is 14.

The /29 translates to a subnet mask of 255.255.255.248.

The network address for this host is 192.168.2.80/29.

The broadcast address for this network is 192.168.2.94/29.

 

14.

Refer to the exhibit. Host A is assigned an IP address of 10.118.197.55/20. How many

additional networked devices will this subnetwork support?

253

509

1021

2045

4093

 

15. When configuring NAT on a Cisco router, what is the inside local IP address?

the IP address of an inside host as it appears to the outside network

the IP address of an outside host as it appears to the inside network

the IP address of an inside host as it appears to the inside network

the configured IP address assigned to a host in the outside network

 

16. Which two addresses could be used as private IP addresses in a LAN? (Choose two.)

10.10.1.200

172.31.100.254

172.64.10.10

192.165.2.1

192.169.1.1

 

17. How does a router keep track of which inside local address is used when NAT

overload is configured?

The router adds an additional bit to the source IP address and maintains a separate

table.

The router modifies the QoS field.

The router uses TCP or UDP port numbers.

The router uses a manual entry that is created and maintained in the database of the

router.

 

18.

Refer to the graphic. A technician is investigating why H1 and H2 cannot communicate.

What problem should the technician discover?

Sw1 has an incorrect default gateway.

H1 and H2 are on different subnetworks.

Sw1 needs an IP address assigned in the same subnetwork.

The H2 IP address should be changed to 192.168.22.34/28.

 

19.

Refer to the exhibit. Which address is an inside global address?

10.1.1.1

10.1.1.2

198.18.1.55

64.100.0.1

 

20.

Refer to the exhibit. What solution would solve the discontiguous network problem and

prevent the routers from advertising misleading networks?

Turn automatic summarization off and manually summarize the routes at the classful

boundary.

Allow automatic summarization to send the most optimal route.

Change the routing protocol to a classless routing protocol, such as RIPv1.

Change the LAN addressing schemes on R2 and R3 to use VLSM since it supports

discontiguous networks.

 

21.

Refer to the exhibit. Which two IP addresses could be assigned to the hosts that are

shown in the exhibit? (Choose two.)

192.168.65.31

192.168.65.32

192.168.65.35

192.168.65.60

192.168.65.63

192.168.65.64

 

22. Which two statements differentiate between flat and hierarchical networks? (Choose

two.)

In a hierarchical design, the network consists of all Layer 2 devices.

In a hierarchical design, a network consists of a single broadcast domain.

In a flat network, all hosts can be reached without having to pass through a router.

In a flat network, hosts using multiple broadcast domains pass through routers.

In a hierarchical design, a network is divided into layers to reduce congestion and the

size of failure domains.

 

23. A network technician has been asked to implement a hierarchical addressing

scheme. Which two statements could describe the hierarchical addressing scheme

structure to the technician? (Choose two.)

A hierarchical addressing structure logically groups networks into smaller subnetworks.

A hierarchical network operates most efficiently without a specific address structure.

Route summarization will operate efficiently in a hierarchical network without a

hierarchical addressing scheme.

A hierarchical addressing structure can simplify network management and improve

scalability.

An effective hierarchical addressing scheme must begin with a classful network at the

distribution layer.