TCP/IP model

Question 1

Protocols and Applications of Application Layer

Answer 1

Telnet, HTTPS, SSH, NTP, FTP, DNS, TFTP, DHCP/BootP, SNMP, APIPA, HTTP

Question 2

What is Telnet

Answer 2

Telephone Network: Be able to run programs on another device

Question 3

What is SSH

Answer 3

Secure Shell: Same as Telnet but it is encrypted where Telnet is in clear text

Question 4

What is FTP

Answer 4

File Transfer Protocol: Sends and receive files using TCP

Question 5

What is TFTP

Answer 5

Trivial FTP and it uses UDP.

Question 6

What is SNMP

Answer 6

Simple Network Management Protocol: Allows us to monitor our network. Uses something called a Network Management Station to gather information about network hosts

Question 7

What is HTTP and HTTPS

Answer 7

Hypertext Transfer Protocol (Secure): Allows us to view webpages

Question 8

What is NTP

Answer 8

Network Time Protocol: Allows us to keep the time synchronized through out our network

Question 9

What is DNS

Answer 9

Domain Name Services: Allows us to resolve human names to IP addresses

Question 10

What is DHCP

Answer 10

Dynamic Host Configuration Protocol: Allows us to receive IP information on a host. Also assigns automatic IP addresses.

Question 11

What is APIPA

Answer 11

Automatic Private IP Addressing: Created by Microsoft. Give us link local address. If device cant get dhcp and no static address is assigned, device will assign itself a 169254 address and thats owned by microsoft.

Question 12

What does the TCP header have

Answer 12

Source and Destination port (16 bits each)
Sequence and Acknowledgement number (32 bits each)
Header, Reserved, Flags (4 bits each)
Window size/flow control (16 bits)
TCP Checksum (16 bit)
Urgent pointer(16 bit)

Question 13

What does UDP header have

Answer 13

Source Port, Destination Port, UDP length, UDP checksum (All 16 bit each). Data (32 bit)

Question 14

When should TCP be used

Answer 14

Email, File Sharing, Downloading, SSH, Telnet, HTTP, HTTPS, DNS

Question 15

When should UDP be used

Answer 15

Voice and Video Streaming, DNS, TFTP, SNMP

Question 16

FTP Port number

Answer 16

21

Question 17

SSH Port Number

Answer 17

22

Question 18

Telnet Port Number

Answer 18

23

Question 19

HTTP Port Number

Answer 19

80

Question 20

HTTPS Port Number

Answer 20

443

Question 21

DNS Port Number

Answer 21

53

Question 22

TFTP Port Number

Answer 22

69

Question 23

SNMP Port Number

Answer 23

161

Question 24

How many bits are in IPv4 Address

Answer 24

32 bits

Question 25

Class A range

Answer 25

0-127.
First Bit in First Octet is 0.
0 is reserved for Cisco
127 is reserved for loopback

Question 26

Class B range

Answer 26

128-191.

First 2 bits in the first octet must be 10

Question 27

Class C range

Answer 27

192-223.

First Three bits must be 110

Question 28

Private IPv4 Addresses

Answer 28

Class A -> 10.0.0.0 to 10.255.255.255
Class B -> 172.16.0.0 to 172.31.255.255
Class C -> 192.168.0.0 to 192.168.255.255