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CCENT Exam Cram: Concepts in IP Addressing

Mar 21, 2008

📄 Contents

␡

Introduction
Binary
Hexadecimal
Conversion Between Binary, Hex, and Decimal
IP Address Components
Subnetting
Exam Prep Questions
Answers to Exam Prep Questions

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CCENT Exam Cram (exam 640-822)

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Exam Prep Questions

Which of the following are alternate representations of the decimal number 227? Choose 2.

	A.	0x227
	B.	11100011
	C.	0x143
	D.	0xE3
	E.	11100110

Which of the following are alternate representations of 0xB8? Choose two.

	A.	10110100
	B.	10111111
	C.	10111000
	D.	184
	E.	0x184

You have been asked to create a subnet that supports 16 hosts. What subnet mask should you use?

	A.	255.255.255.252
	B.	255.255.255.248
	C.	255.255.255.240
	D.	255.255.255.224

Given the mask 255.255.254.0, how many hosts per subnet does this create?

	A.	254
	B.	256
	C.	512
	D.	510
	E.	2

You are a senior network engineer at True North Technologies. Your boss, Mr. Martin, asks you to create a subnet with room for 12 IPs for some new managers. Mr. Martin promises that there will never be more than 12 managers, and he asks you to make sure that you conserve IP address space by providing the minimum number of possible host IPs on the subnet. What subnet mask will best meet these requirements?

	A.	255.255.255.12
	B.	255.255.255.0
	C.	255.255.240.0
	D.	255.255.255.240
	E.	255.255.255.224

Your boss Duncan does not seem to be able to grasp subnetting. He comes out of a management meeting and quietly asks you to help him with a subnetting issue. He needs to divide the Class B address space the company uses into six subnets for the various buildings in the plant, while keeping the subnets as large as possible to allow for future growth. Because the company has not upgraded their Cisco equipment since it was purchased several years ago, none of the routers supports the "ip subnet zero" command. What is the best subnet mask to use in this scenario?

	A.	255.255.0.0
	B.	255.255.248.0
	C.	255.255.224.0
	D.	255.255.240.0
	E.	255.255.255.224

You have purchased several brand-new Cisco routers for your company. Your current address space is 172.16.0.0 /22. Because these new routers support the "ip subnet zero" command, you realize you are about to gain back two subnets that you could not use with the old gear. How many subnets total will be available to you once the upgrades are complete?

	A.	4
	B.	2
	C.	32
	D.	62
	E.	64

Which of the following are true about the following address and mask pair: 10.8.8.0 /24? Choose all that apply.

	A.	This is a Class B address.
	B.	This is a Class A address.
	C.	This is a Class C address.
	D.	16 bits were stolen from the host field.
	E.	24 bits were stolen from the host field.
	F.	The default mask for this address is 255.0.0.0.
	G.	The mask can also be written as 255.255.255.0.
	H.	The mask creates 65,536 subnets total from the default address space.
	I.	Each subnet supports 256 valid host IPs.
	J.	Each subnet supports 254 valid host IPs.

Indy and Greg have configured their own Windows XP PCs and connected them with crossover cables. They can't seem to share their downloaded MP3 files, however. Given their configurations, what could be the problem?

Indy's configuration:
IP:	192.168.0.65
Mask:	255.255.255.192
Greg's configuration:
IP:	192.168.0.62
Mask:	255.255.255.192

	A.	Indy is using a Broadcast ID for his IP.
	B.	Greg is using an invalid mask.
	C.	Indy's IP is in one of the Zero Subnets.
	D.	Greg and Indy are using IPs in different subnets.

You are given an old router to practice for your CCNA. Your boss Dave has spent a lot of time teaching you subnetting. Now he challenges you to apply your knowledge. He hands you a note that says:

"Given the subnetted address space of 192.168.1.0 /29, give the E0 interface the first valid IP in the eighth subnet. Give the S0 interface the last valid IP in the twelfth subnet. The Zero Subnets are available. You have 10 minutes. Go."

Which two of the following are the correct IP and Mask configurations? Choose 2.

A.	E0: 192.168.1.1	255.255.255.0
B.	E0: 192.168.1.56	255.255.255.248
C.	E0: 192.168.1.57	255.255.255.248
D.	S0: 192.168.1.254	255.255.255.0
E.	S0: 192.168.1.95	255.255.255.248
F.	S0: 192.168.1.94	255.255.255.248

The following questions are part of a Subnetting SuperChallenge. This monster question will stretch your subnetting skills, especially if you give yourself a time limit. Start with 10 minutes and see if you can get down to 5.

The Vancouver Sailing Company has four locations: a head office and three branch offices. Each of the branches is connected to the head office by a point-to-point T1 circuit. The branches have one or more LANs connected to their routers. The routers are called Main, Jib, Genoa, and Spinnaker. The company has been assigned the 172.16.0.0/20 address space to work within.

Your task will be to choose the correct IP address and mask for each interface, based on the information provided. Remember that no IP address may overlap with any address in another subnet, and that the required number of hosts for each subnet will affect your decision as to which address to use.

Here are the known IP configurations for the routers:

Main:

S0/0:172.16.0.1 /30

S0/1:172.16.0.5 /30

S0/2:172.16.0.9 /30

Fa1/0:172.16.4.1 /23

Fa1/1:172.16.6.1 /23

Jib:

S0/0: Connects to Main S0/0.

Fa1/0: 172.16.8.33/27.

Fa1/1: 30 hosts needed.

Genoa:

S0/0: Connects to Main S0/1.

Fa1/0: 172.16.8.129/26.

Fa1/1: 100 hosts needed.

Fa2/0: 100 hosts needed.

Fa2/1: 172.16.13.0/24.

Spinnaker:

S0/0: connects to Main S0/2.

Fa1/0: 500 Hosts needed.

Choose the correct IP and mask assignments for each router:

	A.	Jib Fa1/1: 172.16.8.62/27
	B.	Jib Fa1/1: 172. 16.8.64/27
	C.	Jib Fa1/1: 172.16.8.65/28
	D.	Jib Fa1/0: 172.16.8.65/27
	E.	Jib Fa1/1: 172.16.8.65/27
	F.	Genoa S0/0: 172.16.0.2/30
	G.	Genoa S0/0:172.16.0.6/30
	H.	Genoa Fa1/1:172.16.12.1/26
	I.	Genoa Fa1/1:172.16.12.1/25
	J.	Genoa Fa2/0:172.16.12.129/24
	K.	Genoa Fa2/0:172.16.12.129/25
	L.	Genoa Fa2/1:172.16.12.193/25
	M.	Genoa Fa2/1:172.16.13.1/25
	N.	Genoa Fa0/2:172.16.13.1/24
	O.	Spinnaker S0/0: 172.16.0.10/30
	P.	Spinnaker S0/0: 172.16.0.12/30
	Q.	Spinnaker Fa1/0: 172.16.13.0/23
	R.	Spinnaker Fa1/0: 172.16.14.0/23
	S.	Spinnaker Fa1/0: 172.16.14.1/23

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