Chapter 7: TCP/IP Basics

Question 1

What layers does TCP/IP operate at?

Answer 1

internet.

Question 2

What are port numbers?

Answer 2

1 - 65535

Question 3

What port number is HTTP?

Answer 3

80

Question 4

What port number is POP3?

Answer 4

110

Question 5

what is a subnet mask?

Answer 5

string of ones followed by zeros

-you line up address. portions that line up with ones are the network id, zeros that line up are the host id.

Question 6

What is ARP?

Answer 6

Address Resolution Protocol: determine, MAC address based on destination IP
-arp -a shows windows current arp table

Question 7

What is IANA?

Answer 7

Internet Assigned Numbers Authority

Question 8

What is a class license?

Answer 8

IP address in contiguous chunks

Question 9

What is the range for Class A adresses

Answer 9

1-126

Question 10

Range for class b address?

Answer 10

128-191

Question 11

Range for class C address

Answer 11

192-223

Question 12

Range for class D addresses

Answer 12

224-239 (multicast)

Question 13

Rand for class E addresses

Answer 13

240-254 (experimental)

Question 14

What is CIDR?

Answer 14

Classes Inter-domain routing

• virtually same thing as subnetting.
• extend subnet mask by adding more network ID from host bits.

Question 15

What is the formula for # of hosts in subnet?

Answer 15

2^x -2 wher x = number of host bits

Question 16

What is the formula for # of subnets?

Answer 16

2^y where y=# bits added to the subnet mask.

Question 17

What are four unofficial standards?

Answer 17

• give default gateway first IP address in the network id
• use ip address in sequential order
• separate servers form clients
• write down whatever I choose to do.

Question 18

What is a DHCP scope?

Answer 18

-range of IP address DHCP server can pass out.

Question 19

What is APIPA?

Answer 19

Automatic Private IP addressing

-DHCP clients designed to generate APIPA autormatically if they do not receive a response to DHCP Discovery message.

Question 20

What ports do DHCP and BOOTP use?

Answer 20

UDP ports 67 and 68

Question 21

ipconfig /renew /release comands for Linux

Answer 21

sudo ifconfig eth0 down

sudo ifconfig eth0 up

Question 22

What are the three ranges of private ip addresses?

Answer 22

10. 0.0.0 through 10.255.255.255 (1 class A license)
11. 16.0.0 through 172.31.255.255(16 class B license)
12. 168.0.9 through 192.168.255.255(256 class C license)