A message consisting of 2400 bits is to be passed over the Internet. The message is passed to the transport layer which appends a 150-bit header, followed by the network layer which uses a 120-bit header. Network layer packets are transmitted via two networks, each of which uses a 26-bit header. The destination network only accepts up to 900 bits long. The number of bits, including headers delivered to the destination network, is?

Question

A message consisting of 2400 bits is to be passed over the Internet. The message is passed to the transport layer which appends a 150-bit header, followed by the network layer which uses a 120-bit header. Network layer packets are transmitted via two networks, each of which uses a 26-bit header. The destination network only accepts up to 900 bits long. The number of bits, including headers delivered to the destination network, is?

2706 bits
2634 bits
2554 bits
2476 bits

LohaHridoy

8 views

2025-01-04 04:42

1 Answers

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AhmedNazir · Accepted Answer · 2022-09-04T04:29:57+06:00

Option 1 : 2706 bits

Given:

Message size = 2400 bits.

The header of the transport layer = 150 bits.

Segment size at transport layer = (Header + Message size) = 150 + 2400 = 2550 bits.

Maximum, transmission unit at destination network = 900 bits

So, At a time, data supported by the destination network = 900 – 26 = 876 bits.

Hence, 2550 bits are divided into packets having a maximum of 876 bits. So:

Length of packet 1 = 874 bits.

Length of packet 2 = 874 bits.

Length of packet 3 = 802 bits.

Total = 2550 bits.

Network layer packets are transmitted via two networks, each of which uses a 26-bit header. So, The number of bits, including headers delivered to the destination network is:

Packet 1 (Data + Header) size = 26 + 26 + 874 = 926 bits.

Packet 2 (Data + Header) size = 26 + 26 + 874 = 926 bits.

Packet 3 (Data + Header) size = 26 + 26 + 802 = 854 bits.

Total = 2706 bits.