chapter 5

Question 1

Hub.

118

Answer 1

a hub is the most basic networking device that connects multiple computers or other network devices together. Unlike a network switch or router, a network hub has no routing tables or intelligence on where to send information and broadcasts all network data across each connection.

Question 2

NIC.

118

Answer 2

Network Interface Card, the NIC is also referred to as an Ethernet card and network adapter. It is an expansion card that enables a computer to connect to a network; such as a home network, or the Internet using an Ethernet cable with an RJ-45 connector.

Question 3

NIC has 2 LED’s to help in diagnosing any functional problem, what are they?
119

Answer 3

1- the Link LED

2- the Activity LED

Question 4

Bridge.

120

Answer 4

a bridge is a device that connects two similar network segments (of the same LAN) together.

Question 5

what would be the reasons of placing a bridge in the network?
120

Answer 5

• to connect 2 segments together.

- to divide a busy network in to segments.

Question 6

is a computer networking device that connects devices together on a computer network, by using packet switching to receive, process and forward data to the destination device.
120

Answer 6

a switch

Question 7

A router.

121

Answer 7

A router is a device that forwards data packets along networks. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP’s network. Routers are located at gateways, the places where two or more networks connect.

Question 8

routers can have different names, what are they?

122

Answer 8

layer 3 switch, multilayer switch.

Question 9

_____ is a software utility or hardware device that limits outside network access to a computer or local network by blocking or restricting network ports. They are a great step for helping prevent un-authorized access to a company or home network.

Answer 9

A firewall

Question 10

DMZ

125

Answer 10

DMZ is short for DeMilitarized Zone and acts as a buffer area between outside users (the internet) and a private (local or wide area network) server. DMZs are typically used by corporations and contain a device that accepts internet traffic such as DNS, FTP and Web servers.

Question 11

DHCP.

126

Answer 11

Dynamic Host Configuration Protocol is a protocol used to assign an IP address to a computer or device that has been connected to a network automatically. Routers, switches, or servers that use DHCP to assign addresses to other computers can make setup and management easier for the network administrator.

Question 12

MLS

130

Answer 12

A multilayer switch (MLS) is a computer networking device that switches on OSI layer 2 like an ordinary network switch and provides extra functions on higher OSI layers.

Question 13

Load balancer.

130

Answer 13

A load balancer is a device that acts as a reverse proxy and distributes network or application traffic across a number of servers.

Question 14

Domain Name Services server.

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Answer 14

A DNS server is a server software program that performs Domain Name Services (DNS). This involves taking a full host name or a domain name and returning it to the corresponding Internet Protocol (IP) address.

Question 15

there are 2 main types of proxy servers. what are they?

135

Answer 15

1- caching proxy server

2- web proxy server

Question 16

A cache server.

135

Answer 16

A caching proxy server is a dedicated network server or service acting as a server that saves Web pages or other Internet content locally. By placing previously requested information in temporary storage, or cache, a cache server speeds up access to data.

Question 17

web proxy server.

135

Answer 17

is used to create a web cache, the web proxy remembers when you visited a site that you had visited before, the site loud faster and some time recalls you information .