TCP/IP basics

Question 1

ICMP

Answer 1

Internet Control Message Protocol

Question 2

5 pieces of simplified IP Header

Answer 2

1. Version
2. Header Length
3. DSCP
4. TTL
5. TCP

Question 3

Version

Answer 3

Defines the IP address type: IPv6, IPv4

Question 4

Header Length

Answer 4

Total size of the IP portion of the packet in words

Question 5

DSCP

Answer 5

Differentiated Services Code Point contains data used by bandwidth sensitive applications

Question 6

TTL

Answer 6

Time to Live which prevents IP packet from indefinitely spinning through the internet by using a counter that decrements by one every time a packet goes through a router

Question 7

Protocol

Answer 7

Protocol field is either TCP or UDP

Question 8

TCP

Answer 8

Transmission Control Protocol which is connection based

Question 9

UDP

Answer 9

User Datagram Protocol which is connectionless

Question 10

Sequence and ACK numbers

Answer 10

Enable the sending and receiving computers to keep track of various pieces of data flowing back and forth

Question 11

Flags

Answer 11

These individual bits give both sides detailed information about the state of the connection

Question 12

Checksum

Answer 12

The checksum checks the TCP header for errors

Question 13

Class A IP Scheme

Answer 13

1.0.0.0-126.255.255.255 (1-126)

Question 14

Class B IP scheme

Answer 14

128.0.0.0-191.255.255.255 (128-191)

Question 15

Class C

Answer 15

192.0.0.0-223.255.255.255 (192-223)

Question 16

Class D

Answer 16

224.0.0.0-239.255.255.255 (224-239) Multicast

Question 17

Class E

Answer 17

240.0.0.0-254.255.255.255 (240-254) Experimental