Review Questions CH1

1.	What is name of the unique physical address that is assigned to every network interface card? IP address Hostname MAC address NetBIOS name
2.	How many bits are used to create an IPv4 address? 8 6 32 64
3.	If you have a Class B address with a default subnet mask and you need to create eight subnets, then which of the following subnet masks should you use? 255.255.255.240 255.255.224.0 255.255.240.0 255.240.0.0
4.	Which of the following IP addresses are valid only for private IP addressing that is filtered from the Internet? (Choose two.) 10.1.1.1 172.17.255.254 11.1.2.4 193.168.2.1
5.	Which information directory protocol is the standard for file transfer over the Internet? TCP UDP FTP HTTP
6.	Which of the following layers of the OSI model is responsible for logical addressing? Application Transport Data Link Network
7.	Which layer of the TCP/IP protocol suite loosely aligns to three layers of the OSI model? Transport Network Interface Application Presentation
8.	Which of the following is a Session layer protocol that is primarily responsible for setting up and tearing down voice and video calls over the Internet? SIP RTP HTTP FTP
9.	Which of the following is an example of an IPv6 address? 192.168.1.1 C0-FF-EE-C0-FF-EE fe80::216:deff:ee09:6d13 ef90::451:defe::ee09:6d13
10.	Which of the following subnet masks should you use to obtain 100 subnets from a Class B network? 255.255.254.0 255.254.0.0 255.255.255.128 There isn't enough information to answer the question.

Answers

1.	C. A Media Access Control (MAC) address is a unique physical address that is assigned to each network interface card. MAC addresses are “burned in” to the card at the manufacturer.
2.	C. An IPv4 address is a 32-bit address. It is composed of four sections of 8 bits each, called octets. Each octet is converted to decimal for configuration purposes, but the computer uses the entire 32-bit address for communication.
3.	B. If you have a Class B address with a default subnet mask, then the current subnet mask is 255.255.0.0. This means you have 16 bits for networks and 16 bits for hosts. If you want to create eight subnets, then you need to solve for 2s > 8. Solving for s, you can determine that you need to use the first 3 bits from the network address to create the subnets. The values of the first 3 bits total 224 (128 + 64 + 32), so the new subnet mask is 255.255.224.0.
4.	A., B. The valid private address ranges include the following: 192.168.0.0-192.168.255.255 172.16.0.0-172.31.255.255 10.0.0.0-10.255.255.255 Only answers A and B fall into these ranges.
5.	C. FTP is an Application layer protocol that uses TCP ports 20 and 21. It is the standard protocol used for file transfer over the Internet.
6.	D. The Network layer of the OSI model is responsible for logical addressing. In most networks today, this is in the form of an IP address.
7.	C. The Application layer of the TCP/IP protocol suite loosely aligns to the Application, Presentation, and Session layers of the OSI model.
8.	A. Session Initiation Protocol (SIP) is a Session layer protocol that is primarily responsible for setting up and tearing down voice and video calls over the Internet. It also enables IP telephony networks to utilize advanced call features such as SS7.
9.	C. An IPv6 address is a 128-bit binary address that is expressed as a hexadecimal address. Leading 0s can be omitted and successive fields of 0s can be represented as ::.
10.	A. A Class B network will by definition have a subnet mask of 255.255.0.0. This means you have 16 host bits with which to work to create 100 subnets. To determine the number of subnets you need, you use the formula 2s ≥ 100. Solving for s, you can determine that you need 7 host bits, since 26 = 64 but 27 = 128. This means that the 128, 64, 32, 16, 8, 4, and 2 values in the third octet will now count in the subnet mask. Adding these values, you get 254, so the new subnet mask is 254.