Chapter 4

Question 1

Which of the following network devices normally create, add, or divide networks or network segments at the network layer of the OSI model?

Bridge

Firewall

Switch

Router

Answer 1

Router

Routers normally create, add, or divide networks or network segments at the network layer of the OSI reference model because they normally are IP-based devices.

Question 2

Which of the following statements about load balancing is true?

Load balancing decreases performance.

Load balancing can be done only on multilayer switches.

Load balancing increases data availability.

Load balancing decreases redundancy.

Answer 2

Load balancing increases data availability.

Load balancing increases redundancy and therefore data availability. Also, load balancing increases performance by distributing the workload. Multilayer switches and DNS servers can serve as load balancers.

Question 3

Which of the following devices forwards data packets to all connected ports?

Content filter

Switch

Router

Hub

Answer 3

Hub

Hubs are inefficient devices that send data packets to all connected devices. Switches pass data packets to the specific destination device. This method significantly increases network performance.

Question 4

Which type of proxy server resides near the web servers and responds to requests?

Adjoining

Reverse

Adjacent

Proximate

Answer 4

Reverse

A reverse proxy server resides near the web servers and responds to requests. These are often used for load balancing purposes because each proxy can cache information from a number of servers.

Question 5

Which of the following is a concept referring to network traffic flow within a data center between servers?

North-South traffic

East-West traffic

South-West traffic

North-East traffic

Answer 5

East West

East-West traffic is a concept referring to network traffic flow within a data center between servers. North-South refers to data transfers between the data center and that outside of the network.

Question 6

Which of the following is a server that receives the incoming signal and then decodes/encodes it and sends it on?

Converter

Backbone

VPN Headend

ICS/SCADA

Answer 6

VPN Headend

A VPN headend (or head-end) is a server that receives the incoming signal and then decodes/encodes it and sends it on

Question 7

Purchasing has just bought a number of “high-density device” hubs without first running them past you. How many devices do each of these hubs typically accommodate?

64

4

16

32

Answer 7

32

Hubs that are labeled as high-density devices typically accommodate up to 32 devices.

Question 8

With the spine and leaf network architecture model, the spine is the backbone of the network and is responsible for interconnecting all the leaf switches in what type of topology?

Full-mesh

Hybrid

Ring

Star

Answer 8

Full Mesh

With the spine and leaf model, the spine is the backbone of the network and is responsible for interconnecting all the leaf switches in a full-mesh topology.

Question 9

Users are complaining that the network’s performance is unsatisfactory. It takes a long time to pull files from the server, and, under heavy loads, workstations can become disconnected from the server. The network is heavily used, and a new videoconferencing application is about to be installed. The network is a 1000BASE-T system created with Ethernet hubs. Which device are you most likely to install to alleviate the performance problems?

Firewall

Router

Media converter

Switch

Answer 9

Switch

Replacing Ethernet hubs with switches can yield significant performance improvements. Of the devices listed, switches are also the only ones that can be substituted for hubs. A router is used to separate networks, not as a connectivity point for workstations. A media converter is used to connect two dissimilar types of network media. A firewall is not a solution to the problem presented.

Question 10

How much faster are full-duplex transmission speeds than half-duplex transmission speeds?

4x

1.5x

0.5x

2x

Answer 10

2x

Full-duplex transmission speeds, in theory, are double that of a standard half-duplex connection.

Question 11

Which of the following would refer to a remote—and autonomous—office with only three users working from it?

Satellite office

Home office

Branch office

SOHO office

Answer 11

Branch office

Any remote and autonomous office, regardless of the number of users who may work from it, is known as a branch office.

Question 12

Which of the following devices can be used to convert between a legacy telephony connection and a VoIP connection using SIP?

UTM appliance

AAA server

VoIP gateway

Content filter

Answer 12

VoIP gateway

A VoIP gateway, also sometimes called a PBX gateway, can be used to convert between a legacy telephony connection and a VoIP connection using Session Initiation Protocol (SIP).

Question 13

Which of the following layers in a three-tiered network datacenter architecture is sometimes called the workgroup layer?

Access

Core

Aggregation

Edge

Answer 13

Aggregation

The distribution layer, or aggregation layer (sometimes called the workgroup layer), is the layer in which management takes place. This is where QoS policies are managed, filtering is done, and routing takes place.

Question 14

At which layers of the OSI model do bridges operate?

3 and 4

2 and 3

1 and 2

4 and 5

Answer 14

1 and 2

Bridging is done at the first two layers of the OSI model.

Question 15

Which of the following are reasons to implement a proxy server?

To protect the internal network from intruders
To provide automatic IP addressing on the network
To centrally control Internet access
To provide NAT services

Answer 15

To centrally control Internet access
To provide NAT services

A proxy server acts as a centralized point for Internet access, thus making it easy to control a user’s Internet use. Also, the proxy server provides Network Address Translation services as requests are sent to the Internet using the address of the proxy server’s external interface, not the system that sent it.

Question 16

With which type of switching environment does the packet begin to be forwarded as soon as it is received?

Ready-set-go

Cut-through

Store-and-forward

Fragment-free

Answer 16

Cut through

In a cut-through switching environment, the packet begins to be forwarded as soon as it is received. In a store-and-forward switching environment, the entire packet is received and error-checked before being forwarded. In a fragment-free switching environment, enough of the packet is read so that the switch can determine whether the packet has been involved in a collision. There is not a ready-set-go switching environment; this is a fictitious choice.

Question 17

Which of the following devices are specifically designed to deal with attenuation?

Passive hub
Repeater
Switch
DHCP server

Answer 17

Switch

Data signals weaken as they travel down a particular medium; this is known as attenuation. To increase the distance a signal can travel, you can regenerate the data signal to give it more strength. A hardware repeater regenerates the data signal as it passes, enabling it to travel farther. Repeaters typically are no longer standalone devices; instead, they are included with the function of a switch. The other answer choices are incorrect because a passive hub and DHCP server are not designed to deal with attenuation.