What is the minimum length of a IP header?
20 bytes
IHL value = (20 bytes)/(4 bytes/word) = 5 words Therefore, the minimum value the IHL field can have is 5. Why 20 Bytes is the Minimum The first 20 bytes of the IPv4 header contain essential information required for routing and processing the packet.
Important Questions from IPv4
An organization is granted the block 130.56.0.0/16. The administrator wants to create 1024 subnets. Find first and last addresses of last subnet.
1.
130.56.0.0
130.56.254.255
2.
130.56.255.0
130.56.255.255
3.
130.56.0.192
130.255.255.255
4.
130.56.255.192
130.56.255.255
An organization is granted the block 130.56.0.0/16. The administrator wants to create 1024 subnets. Find the subnet prefix.
An organization is granted the block 130.56.0.0/16. The administrator wants to create 1024 subnets.
Find first and last addresses of First subnet.
1.
130.56.0.0
130.56.254.254
2.
130.56.0.0
130.56.0.63
3.
130.0.0.0
130.255.255.255
4.
130.56.0.0
130.56.255.63
Suppose a message of size 15000 bytes is transmitted from a source to a destination using IPv4 protocol via two routers as shown in the figure. Each router has a defined maximum transmission unit (MTU) as shown in the figure, including IP header. The number of fragments that will be delivered to the destination is ________ . (Answer in integer)
- A machine receives an IPv4 datagram. The protocol field of the IPv4 header has the protocol number of a protocol X.
Which ONE of the following is NOT a possible candidate for X?
