Which portion of a class c address designates the network address?

 Please see below as the answer is self-explanatory

Explanation:

Assuming that the question refers to the IPv4 protocol, all IP addresses have the same quantity of bits, 32 bits.

The main differences in the Class A, B and C types, resides in the different number of bits assigned to the network identification portion (netid), and the one reserved for the hosts in this network (hostid).

In the case of  class C addresses, we have 24 bits for the network identification (netid), and the remaining 8 bits in order to identify uniquely the different hosts in the network.

All Class C addresses begin with the binary sequence 110, which identifies uniquely to all the addresses in this class, due to type A start with 0, type B starts with 10 ,and 111 is reserved for class D addresses.

answer; i believe the correct answer is (a) all trenches must have access/egress;