TCP/IP

Question 1

Class A Addresses

Answer 1

First Octet Value is 1-127

Subnet Mask is 255.0.0.0

of Hosts per network is 16,777,214

Question 2

Class B Addresses

Answer 2

First Octet Value is 128-191

Subnet Mask is 255.255.0.0

of Hosts per network is 65,534

Question 3

Class C Addresses

Answer 3

First Octet Value is 192-223

Subnet Mask is 255.255.255.0

of Hosts per network is 254

Question 4

Class D Addresses

Answer 4

Used for multicasting applications

First Octet Value is 224-239

Has potential for 268,435,456 unique multicast groups that users can subscribe to from a multicast application.

Question 5

Class E Addresses

Answer 5

Designed for experimental purposes

First Octet Value is 240-247

Question 6

Port 20

Answer 6

FTP Data

Port used by FTP to send data to a client

Question 7

Port 21

Answer 7

FTP Control

Port used by FTP commands sent to the server

Question 8

Port 22

Answer 8

SSH

Port used by Secure Shell (SSH) to encrypt remote access communication. It typically is used as a secure replacement to Telnet.

Question 9

Port 23

Answer 9

Telnet

Port used by Telnet to remotely connect to a system such as a server or router.

Question 10

Port 25

Answer 10

SMTP

Port used to send Internet e-mail.

Question 11

Port 53

Answer 11

DNS (Domain Name System)

Port used for DNS zone transfers

Question 12

Port 80

Answer 12

HTTP

Internet protocol delivering web pages to the browser.

Question 13

Port 110

Answer 13

POP3

Port used by POP3, which is the internet protocol to read e-mail.

Question 14

Port 139

Answer 14

NetBIOS

Port used by the NetBIOS session service and is used to establish a connection between two systems for NetBIOS communication.

Question 15

Port 143

Answer 15

IMAP

Port used by IMAP, which is a newer internet protocol to read e-mail.

Question 16

Port 443

Answer 16

HTTPS

Port used for secure web traffic

Question 17

Port 3389

Answer 17

Port used by Remote Desktop Protocol (RDP) for remote administration of a Windows system.

Question 18

Port 53

Answer 18

UDP

DNS

UDP port 53 is used for DNS queries

Question 19

Port 67 and 68

Answer 19

UDP

DHCP

UDP port 67 is used by the DHCP service, and UDP port 68 is used by client requests.

Question 20

Port 69

Answer 20

UDP

TFTP (Trivial File Transfer Protocol)

Trivial File Transfer Protocol is used to download files without requiring authentication.

Question 21

Port 137 and 138

Answer 21

UDP 137 and 138 are used by the NetBIOS name service and datagram service

Question 22

Port 161

Answer 22

UDP

SNMP

UDP Port 161 is used by the Simple Network Management Protocol.