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An IP packet has arrived with the first 8 bits as 0100 0010. Which of the following is correct ?
- a)The number of hops this packet can travel is 2
- b)The total number of bytes in header is 16 bytes.
- c)The upper layer protocol is ICMP
- d)The receiver rejects the packet
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
An IP packet has arrived with the first 8 bits as 0100 0010. Which of ...
Explanation:
To determine the correct option, let's analyze the given information about the IP packet:
The first 8 bits of the IP packet are 0100 0010.
IP Version:
The first 4 bits of an IP packet represent the IP version. In this case, the first 4 bits are '0100', which corresponds to IP version 4. Therefore, the IP packet is using IPv4.
Header Length:
The next 4 bits of an IP packet represent the header length. In this case, the next 4 bits are '0010', which corresponds to a header length of 2 words. Each word is 4 bytes. So, the total header length is 2 * 4 bytes = 8 bytes.
Hops:
The number of hops a packet can travel is determined by the Time to Live (TTL) field in the IP header. However, in this case, the first 8 bits do not provide any information about the TTL. Therefore, we cannot determine the number of hops from the given information.
Upper Layer Protocol:
The upper layer protocol is determined by the Protocol field in the IP header. However, the first 8 bits do not provide any information about the upper layer protocol. Therefore, we cannot determine the upper layer protocol from the given information.
Receiver's Action:
The receiver's action cannot be determined from the first 8 bits of the IP packet. The receiver may reject the packet for various reasons such as invalid checksum, incorrect IP version, or other errors. However, we cannot determine the receiver's action solely based on the given information.
Therefore, the correct option is 'D) The receiver rejects the packet' since it is the only option that cannot be determined from the given information.
To determine the correct option, let's analyze the given information about the IP packet:
The first 8 bits of the IP packet are 0100 0010.
IP Version:
The first 4 bits of an IP packet represent the IP version. In this case, the first 4 bits are '0100', which corresponds to IP version 4. Therefore, the IP packet is using IPv4.
Header Length:
The next 4 bits of an IP packet represent the header length. In this case, the next 4 bits are '0010', which corresponds to a header length of 2 words. Each word is 4 bytes. So, the total header length is 2 * 4 bytes = 8 bytes.
Hops:
The number of hops a packet can travel is determined by the Time to Live (TTL) field in the IP header. However, in this case, the first 8 bits do not provide any information about the TTL. Therefore, we cannot determine the number of hops from the given information.
Upper Layer Protocol:
The upper layer protocol is determined by the Protocol field in the IP header. However, the first 8 bits do not provide any information about the upper layer protocol. Therefore, we cannot determine the upper layer protocol from the given information.
Receiver's Action:
The receiver's action cannot be determined from the first 8 bits of the IP packet. The receiver may reject the packet for various reasons such as invalid checksum, incorrect IP version, or other errors. However, we cannot determine the receiver's action solely based on the given information.
Therefore, the correct option is 'D) The receiver rejects the packet' since it is the only option that cannot be determined from the given information.
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Community Answer
An IP packet has arrived with the first 8 bits as 0100 0010. Which of ...
Concept:
Minimum header size of IPv4 = 20 byte
Maximum header size of IPv4 = 60 byte
Header length field in the IPv4 header is 4 bits.
Maximum possible value (1111) = 15
The scaling factor of 60/15 = 4 is introduced
Minimum header size of IPv4 = 20 byte
Maximum header size of IPv4 = 60 byte
Header length field in the IPv4 header is 4 bits.
Maximum possible value (1111) = 15
The scaling factor of 60/15 = 4 is introduced
Explanation:
IP header:
IP header:
But the first 8 bits in the Question are 0100 0010.
The first 4 bits indicate the version which is IPv4 (0100)
Now the next four bit indicates Header length (bits decimal value × 4) which is 2 × 4 = 8 bytes
which is not possible since the minimum header length for IPv4 is 20 bytes.
Hence Receiver will reject the packet.
Therefore option d is the correct answer.
The first 4 bits indicate the version which is IPv4 (0100)
Now the next four bit indicates Header length (bits decimal value × 4) which is 2 × 4 = 8 bytes
which is not possible since the minimum header length for IPv4 is 20 bytes.
Hence Receiver will reject the packet.
Therefore option d is the correct answer.
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Question Description
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