Hi, struggling with computer networks questions much help would be greatly appre

Question

Hi, struggling with computer networks questions much help would be greatly appreciated

- if using 16 bits for the network part of a class B address, 20 bits have been used. How many class B networks would there have been?

- class B network on the internet has a subnet mask of 255.255.240.0, what is the maximum number of host per subnet?

-arp & rarp both map addresses from one space to another, in this respect, they are similar. however their implementations are fundamentally different, in what major way do they differ?

Explanation / Answer

Below are your answers. Please let me know in comments if you have trouble understanding any of it. I'll help for sure

1. if using 16 bits for the network part of a class B address, 20 bits have been used. How many class B networks would there have been?

The question here means that Class B uses 16 bit network address, but in place of 16 bit we use 20 bit network address for class B. So we need to find number of networks possible in that case.

The number of networks possible can be calculated using the formula 2number of bits of class but the class B always starts with 10(binary) so formula becomes 2number of bits of class -2. Here we use 20 bits . SO

number of networks = 220-2 = 218 = 262,144 networks

2. class B network on the internet has a subnet mask of 255.255.240.0, what is the maximum number of host per subnet?

Default subnet mask of class B is 255.255.0.0 . Subnet mask 255.255.240.0 for this class means, we have added 4 subnetting bits means we have 232-20 = 212 addresses per subnet i.e 4096 addresses per subnet. number of subnets is 16.

3. arp & rarp both map addresses from one space to another, in this respect, they are similar. however their implementations are fundamentally different, in what major way do they differ?

ARP stands for Address resolution protocol and RARP stands for Reverse address resolution protocol. ARP is used to get the physical address of the machine using the logical address or IP address. RARP is used to get the IP address from physical address.

The key difference on there implementation is that RARP have a server called RARP server that answer these requests, but ARP does not have any server like that.

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