Answers to Chapter 8 Review Basics - ProfessorV.com

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CHAPTER 8

REVIEWING THE BASICS

1.

Name three types of Ethernet. What transmission speed does each support?

10
-
Mbps Ethernet (10 Mbps), Fast Ethernet (100 Mbps), and Gigabit Ethernet (1000 Mbps)

2.

When using dynamic IP addressing, what type of server must be on

the network?

DHCP server

3.

Give an example of a classful subnet mask. Give an example of a classless subnet mask.

Possible answers: 255.255.255.0, 255.255.240.0

4.

Which is more efficient for networking traffic, a switch or a hub? Why?

A switch because a switc
h does not broadcast traffic to every node connected to the device as
does a hub. A switch sends traffic only to the node for which the packet is intended.

5.

Is 172.16.50.100 intended to be a public or private IP address?

Private

6.

What are three ways a wirele
ss network can be secured?

Filter MAC addresses, use WEP encryption,
or
use a VPN.

7.

What connecting device do you use for a small LAN? Two or more connected networks?

For a small network, a switch is best. To connect two or more networks, a router is requir
ed.




8.

Describe the structure of an IP address. How is it different from a MAC address?

An IP address is a series of four numbers, each no larger than 255, separated by periods. A MAC
address is expressed as six pairs of hex numbers separated by dashes. A

MAC address cannot
change, but an IP address can change on a computer; a MAC address is like a local address, and
an IP address is like a long
-
distance address.

9.

How many potential IP addresses are there?

4.3 billion

10.

How many networks and addresses are ava
ilable for Class A IP addresses? Class B?
Class C?

Class A: 127 networks; 16 million addresses

Class B: 16,000 networks; 65,000 addresses

Class C: 2 million networks; 254 addresses

11.

Why are Class D and E addresses not available to individuals and companies?

Class D addresses are used for multicasting, and Class E addresses are reserved for research.

12.

Which octets are used for the network address and for host addresses in Class A? Class
B? Class C?

Class A: N.H.H.H

Class B: N.N.H.H

Class C: N.N.N.H

13.

In what cla
ss is the IP address 185.75.255.10?

Class B

14.

In what class is the IP address 193.200.30.5?

Class C

15.

Describe the difference between public and private IP addresses. If a network is using
private IP addresses, how can the computers on that network access the
Internet?

Public IP addresses are available for use on the Internet. Private IP addresses are used on private
intranets that are isolated from the Internet. Networks that use private IP addresses can access the
Internet through a proxy server, which substi
tutes its IP address for the address of the device
trying to access the Internet.

16.

Why is it unlikely that you will find the IP address 192.168.250.10 on the Internet?

It is unlikely b
ecause this address is in one of the IP address ranges that RFC 1918 reco
mmends
be reserved for private networks.

17.

Which Windows operating system does not automatically include the NetBEUI protocol?

Windows XP

18.

What are the two ways an IP address can be assigned to a PC? What is one advantage of
each?

IP addresses can be assigne
d through static addressing (in which IP addresses are permanently
assigned to workstations) or dynamic addressing (in which IP addresses are assigned for the
current session only). An advantage of static IP addressing is that it does

no
t require a DHCP
se
rver. An advantage of dynamic IP addressing is that fewer IP addresses than the total number of
workstations can satisfy the needs of a network.

19.

For w
hat are the Ping, Ipconfig, and Winipcfg utilities used?

The Ipconfig (on Windows 2000/XP) and Winipcfg (o
n Windows 9x) commands are used to
display a machine’s IP address and the MAC address of its NIC. The Ping command is used to
send a signal to a remote computer and test connectivity.



20.

Of IPX/SPX, TCP/IP, and NetBEUI, which is routable and which is not?

I
PX/SPX and TCP/IP are routable, and NetBEUI is not.

21.

When a PC reports it has used an automatic private IP address, what can you assume
about the network configuration and current connectivity?

The PC is configured for dynamic IP addressing, but the PC was
not able to lease an IP address
from a DHCP server. The PC might not be connected to the network or the server might be down.

22.

A network uses a subnet mask of 255.255.255.0 and has a computer on the network with
an IP address of 120.12.12.3. Will the IP add
ress 120.12.10.3 be on the network? Explain
your answer.

No, because the subnet mask tells us that computers on this network all have IP addresses with
the first three octets the same.

23.

What networking protocol was first used by Novell NetWare and is not su
pported on the
Internet?

IPX/SPX

24.

If you were going to connect two PCs together in a simple network using the network
ports on each PC, what type of cable would you use?

Crossover cable

25.

What name resolution service is used on the Internet, DNS or WINS? Why
?

DNS, because WINS is only supported by Microsoft operating systems and tracks NetBIOS
names which are not used on the Internet.