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The maximum number of IPv4 router address addresses that can be listed in the record route (RR) option field of an IPv4 header is ____.
Note: This question appeared as Numerical Answer Type.
Note: This question appeared as Numerical Answer Type.
- a)8
- b)9
- c)10
- d)11
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The maximum number of IPv4 router address addresses that can be listed...
Record Route is an optional field used to record address.
In IPv4 header, 40 bytes are reserved for OPTIONS. For Record Route to stores, 1 byte is used to store type of option, 1 byte for length and 1 byte for pointer. Out of 40, 37 bytes are left.
An IP4 address takes 32 bits or 4 bytes.
We can store at most floor(37/4) = 9 router addresses.
Alternate Solution
In IPV4 frame format there are 40 bytes of option field, out of which only 38 bytes can be used, 2 bytes are reserved . Also one IPV4 adress is of 4 bytes
Thus maxmimum IPV4 address that can be hold <= 38/4 = 9
In IPv4 header, 40 bytes are reserved for OPTIONS. For Record Route to stores, 1 byte is used to store type of option, 1 byte for length and 1 byte for pointer. Out of 40, 37 bytes are left.
An IP4 address takes 32 bits or 4 bytes.
We can store at most floor(37/4) = 9 router addresses.
Alternate Solution
In IPV4 frame format there are 40 bytes of option field, out of which only 38 bytes can be used, 2 bytes are reserved . Also one IPV4 adress is of 4 bytes
Thus maxmimum IPV4 address that can be hold <= 38/4 = 9
Most Upvoted Answer
The maximum number of IPv4 router address addresses that can be listed...
Maximum number of IPv4 router addresses in the record route (RR) option field
The record route (RR) option field in the IPv4 header is used to record the route that a packet takes through the network. It allows routers to add their IP addresses to the list as the packet traverses the network. The maximum number of IPv4 router addresses that can be listed in the RR option field is determined by the size of the field itself.
Size of the RR option field
The RR option field is 40 bits in length. This includes a 3-bit type field, a 5-bit length field, and the remaining bits for storing the IP addresses. The length field specifies the length of the option in 32-bit words. Therefore, the maximum number of addresses that can be stored in the RR option field can be calculated as follows:
Calculation
- Each IP address is 32 bits long.
- The length field is 5 bits long, which means it can represent values from 0 to 31.
- The length field specifies the length of the option in 32-bit words.
- Therefore, the maximum number of addresses that can be stored in the RR option field is 31 * (32 / 32) = 31.
Conclusion
The maximum number of IPv4 router addresses that can be listed in the RR option field of an IPv4 header is 31. Therefore, option 'B' (9) is the correct answer.
The record route (RR) option field in the IPv4 header is used to record the route that a packet takes through the network. It allows routers to add their IP addresses to the list as the packet traverses the network. The maximum number of IPv4 router addresses that can be listed in the RR option field is determined by the size of the field itself.
Size of the RR option field
The RR option field is 40 bits in length. This includes a 3-bit type field, a 5-bit length field, and the remaining bits for storing the IP addresses. The length field specifies the length of the option in 32-bit words. Therefore, the maximum number of addresses that can be stored in the RR option field can be calculated as follows:
Calculation
- Each IP address is 32 bits long.
- The length field is 5 bits long, which means it can represent values from 0 to 31.
- The length field specifies the length of the option in 32-bit words.
- Therefore, the maximum number of addresses that can be stored in the RR option field is 31 * (32 / 32) = 31.
Conclusion
The maximum number of IPv4 router addresses that can be listed in the RR option field of an IPv4 header is 31. Therefore, option 'B' (9) is the correct answer.
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The maximum number of IPv4 router address addresses that can be listed in the record route (RR) option field of an IPv4 header is ____.Note:This question appeared as Numerical Answer Type.a)8b)9c)10d)11Correct answer is option 'B'. Can you explain this answer?
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