FUNDAMENTALS OF COMPUTER

COMPUTER THREATS SECURITY

WHAT IS A FIREWALL IN NETWORK SECURITY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which protocols and port numbers are used by DHCP?

A	TCP/UDP 67
B	TCP/UDP 69
C	TCP/UDP 123
D	None of the above

Explanation:

Detailed explanation-1: -The DHCP employs a connectionless service model, using the User Datagram Protocol (UDP). It is implemented with two UDP port numbers for its operations which are the same as for the bootstrap protocol (BOOTP). The server listens on UDP port number 67, and the client listens on UDP port number 68.

Detailed explanation-2: -UDP port number 67 is used for the server and UDP port number 68 is used for the client. This is very unusual. Most software uses a well-known port on the server side and a randomly generated port on the client side.

Detailed explanation-3: -DHCP servers have a User Datagram Protocol (UDP) port number of 67, so listen for messages addressed to this port number.

Detailed explanation-4: -DHCP servers also use port 67 to initiate communication between the client and server on the network. If port 67 is used by another application, DHCP will fail to function. Clients use port 68.

There is 1 question to complete.