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When we look at the bit locations, the first two bits of the fourth octet will be 128+64=192. Thus the subnet
mask will be 255.255.255.192. Since there is no room to adjust the allocation, everything fits fully into 8 bits,
none of the other subnet masks will provide this combination.
Incorrect Answers:
B, C and D are incorrect; these subnet mask provide too many networks and not enough host addresses.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 225-228 and 236.
Q. 115
What are two purposes of segmenting a network with a bridge? (Choose two)
A. To reduce collisions.
B. To increase collisions.
C. To add collision domains.
D. To reduce collision domains.
E. To have more broadcast domains.
Answer: A, C
Explanation: When you segment a network with a bridge you are reducing the number of collisions by creating
another collision domain.
Incorrect Answers:
B is incorrect; a bridge decreases collisions, not increases collisions.
D is incorrect; Collision domains are increased, not decreased.
E is incorrect; there is still one and only one broadcast domain.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 21-24.
Q. 116
What is an advantage of using a connectionless protocol such as UDP?
A. Packet acknowledgement may reduce overhead traffic.
B. Loss or duplication of data packets is less likely to occur.
C. Packets are not acknowledged which reduces overhead traffic.
D. The application relies on the transport layer for sequencing of the data packets.