Case Project 9-1 - Bakersfield College

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Network+

Guide to Networks,
6
th

Edition


Solutions

9


1

Network+ Guide to Networks,
6
th Edition


Chapter
9

Solutions


Review Questions


1.

A node on a network has an IP address of 140.133.28.72 and its subnet mask is

255.248.0.0. What type of subnetting has been used on this network?

a.

Classless

b.

Supernetting

c.

Classful

d.

No subnetting has been used.

2.

What is the d
efault subnet mask for a Class C

network?

a.

0.0.0.0

b.

255.255.255.0

c.

255.
255.0.0

d.

255.0.0.0

3.

Convert the following subnet mask into its dotted
-
decimal equivalent: 11111111

11
111111 11111000 00000000.

a.

1.1.224.0

Network+

Guide to Networks,
6
th

Edition


Solutions

9


2

b.

224.224.128.0

c.

255.255.255.0

d.

255.255.248.0

4.

On a network with an IP address of 140.133.28.72 (or 10001100 10000101
0001110001001000) and a subnet mask of 255.248.0.0 (or 11111111 11111000
0000000000000000),
what is the network ID?

a.

140.128.0.0 (or 10001100 10000000 00000000 0000000)

b.

140.248.0.0 (or 10001100 11111000 00000000 00000000)

c.

140.133.20.0 (or 10001100 10000101 00010100 00000000)

d.

255.248.0.1 (or 11111111 11111000 00000000 00000001)

5.

As a
networking consultant, you've been asked to help expand a client's TCP/IP
network.

The network administrator tells you that the network ID is subnetted as
185.27.54.0/26.

On this network, how many bits of each IP address are devoted to
host information?

a.

4

b.

6

c.

14

d.

26

6
.

You have decided to create 254 subnets on your Class B network. What subnet mask

will you use to accomplish this?

a.

255.255.0.0

b.

255.254.0.0

c.

255.255.254.0

Network+

Guide to Networks,
6
th

Edition


Solutions

9


3

d.

255.255.255.0

7
.

If you subdivide your Class B network into 254 subne
ts, what is the maximum
number

of hosts you can assign to any single subnet?

a.

255

b.

212

c.

254

d.

225

8.

If you worked on a
network that could not interpret classless addressing, and

your
network ID was 145.27.0.0, what is the theoretical maximum number

of different

subnets you could create on this network?

a.

16

b.

64

c.

128

d.

254

9.

Your company has leased a Class C network whose network ID is 205.61.128.0. You

want to create 16 subnets within this network. One of the subnets will have an
extended

network prefix of 205.61.128.64. What will be the broadcast address for this
subnet?

(Hint:
If you know the number of hosts per subnet, you can easily determine
the

broadcast address.)

a.

205.61.128.79

b.

205.61.128.143

c.

205.61.128.31

d.

205.61.128.95

Network+

Guide to Networks,
6
th

Edition


Solutions

9


4

10
.

Your workstation's IP address is 10.35.88.12, and your supervisor's workstation's IP

address is 10.35.91.4. When you send data from your workstation to your supervisor's

workstation, what is the most likely IP address of the first default gateway that wi
ll

accept and interpret your transmission?

a.

10.35.88.12

b.

10.35.1.1

c.

10.35.88.1

d.

10.35.91.1

1
1
.

You
have enabled NAT on your small office’s router. The router’s private network IP
address is 198.162.6.1. Which of the following IP addresses is the mo
st likely to be
automatically assigned to one of the workstations that uses this router as its default
gateway?

a.

19
2.168
.6.1

b.

19
2.168
.6.6

c.

19
2.168
.255.0

d.

19
2.168
.255.255

1
2
.

Which two of the following are benefits of using IMAP4 relative to POP3?

a
.

It allows users to review and delete mail without downloading it from the
mail server.

b.

It provides mail delivery guarantees.

c.

It allows users to modify mail server settings.

d.

It provides better encryption for message attachments.

e.

It enables mul
tiple users to easily share a central mailbox.

Network+

Guide to Networks,
6
th

Edition


Solutions

9


5

13
.

You have decided to use PAT on your small office network. At minimum, how many
IP

addresses must you obtain from your ISP in order for all five clients in your office
to

be able to access servers on the In
ternet?

a.

1

b.

4

c.

5

d.

None, the private IP addresses will work.

14.

What Network layer protocol does the traceroute utility use to obtain its information

about paths between a source and destination?

a.

UDP

b.

ARP

c.

NTP


d.

ICMP

15.

Which of the
following commands allows you to view the routing table on your
Linux

workstation? (Choose all that apply.)

a.

netstat
-
r

b.

traceroute

c.

netroute
-
R

d.

route

e.

tracepath


1
6
.

If you know that your colleague's TCP/IP host name is JSMITH, and you need to

find

out his IP address, which of the following commands should you type at your shell

prompt or command prompt?

Network+

Guide to Networks,
6
th

Edition


Solutions

9


6

a.

netstat jsmith


b.

nbtstat jsmith

c.

nslookup jsmith

d.

ifconfig jsmith

1
7
.

Suppose your office's only DNS server was down, and you wanted

to view the DNS

address record for your company's domain. Which of the following TCP/IP utilities

would allow you to do this?

a.

nbtstat

b.

netstat

c.

traceroute

d.

dig

18
.

When you use the
mtr

command to assess the path from your office workstation to a

server on your company's WAN that's located in Spain, what is the first hop the
mtr

command will display?

a.

Your workstation's IP address

b.

Your default gateway's IP address

c.

Your ISP's router's IP address

d.

The Web server's address

19
.

Which of the
following commands reveals the default gateway addresses for all the

hosts to which a router is connected?

a.

route

b.

ping

c.

host

Network+

Guide to Networks,
6
th

Edition


Solutions

9


7

d.

ifconfig

20
.

What utility might you use to find out whether your ISP's router is responsible for the

poor network perfor
mance your organization experiences on a particular afternoon?

a.

route

b.

netstat

c.

mtr

d.

ipconfig

Hands
-
On Projects


Project
9
-
1

In this project students
first
experiment with the netstat
utility to learn about their
workstation’s TCP/IP port connectio
ns and core protocol statistics. Next, students
try the

traceroute (or tracert

or tracepath)

utility

to view the path between their
workstation and the cengage.com domain
.
Finally, students use the mtr or
pathping utility to view statistics about the route

between their workstation and
the comptia.org domain.

This project is written to work with UNIX, Linux,
and Windows 7 systems

that
are connected to the Internet.
(Steps will also work with Windows XP or Vista
workstations.)
Command responses will vary acc
ording to the network and type
of workstation students use.


Network+

Guide to Networks,
6
th

Edition


Solutions

9


8

Project
9
-
2

In this project, students
use the nslookup utility to determine a

domain’s
name
server address and
mail server address, t
hen perform

t
ests to verify that the mail
server is working.
At the end of the project, they use the whois utility from
ARIN’s Web site to determine
the technical contact information for the
cengage.com domain
.

This project is written to work with UNIX, Linux,
and Windows
7

systems that
are connected to the Interne
t and have a modern browser installed.


Project
9
-
3

In this project students log on to a wireless router with Administrator credentials
and view the default NAT/DHCP settings.

Notably,

Step 6: Students review the default IP address and DHCP address
range assigned
to the router.

Steps 7
-
8: Students use the ipconfig command to view their TCP/IP settings,
specifically, the IP address that the router has assigned their workstation

Steps 9
-
11: Students change the router’s IP address and the range it will
use for
DHCP addressing.

Step 12: Students again use the ipconfig command to view their TCP/IP settings;
this time, they should see a different IP address than what they saw in Steps 7
-
8.




Network+

Guide to Networks,
6
th

Edition


Solutions

9


9

Case Projects


Case Project
9
-
1

Students should recommend some t
ype of NAT situation for the local
architecture
firm
, because this would provide flexibility for all the museum’s clients, ease IP
address management, and conserve IP addresses. The student’s network drawing
should include the router, switches, workgroup a
reas, plus at least one gateway
that can accomplish NAT (which could be incorporated in the router or might
even be part of a server). Students should also explain that each client’s TCP/IP
configuration should be modified to use DHCP rather than static ad
dressing.


Case Project
9
-
2

Students should demonstrate an understanding of mail server software and
protocols, including SMTP and, at least, IMAP (if not also POP). For each
protocol, students should be able to identify the port number(s) used. Students
s
hould add a mail server (behind the border router, possibly attached to a switch)
on the network diagram they created in Case Project 9
-
1.


Case Project
9
-
3

Students might suggest mtr or pathping as the single utility that will provide the
most helpful inf
ormation about this traffic deluge. They might also suggest
Network+

Guide to Networks,
6
th

Edition


Solutions

9


10

pinging LAN connectivity devices individually (at first) to find out which ones
are responding slowly and therefore overtaxed. Netstat on the right device would
show which TCP/IP processes are act
ive, offering further clues. (On a UNIX or
Linux system, the who command might also provide useful troubleshooting
information.)