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Explanation:
Bridge networks have the following characteristics: each segment has its own collision domain, all connected
devices are part of the same broadcast domain, and all segments must have the same data link layer
implementation.
Incorrect Answers:
B is incorrect; when a network is segmented by a bridge the collisions domains increase and not decrease.
C and D are incorrect; the addition of a bridge to a network has no effect on the number of domains.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 23-4.
Q. 15
Exhibit:
Router#show interface serial 0
Serial0 is down, line protocol is down
Hardware is HD64570
Internet address is 172.22.5.1/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
Last input never, output 00:03:11, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max(drops): Total output drops: 0
Queuing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max active/threshold/drops)
Conversations 0/2/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
11 packets output, 476 bytes, 0 underruns
0 output errors, 0 collisions, 27 interface resets
0 output buffer failures, 0 output buffers swapped out
11 carrier transitions
DCD=down DSR=down DTR=down RTS=down CTS=down
Based on the output of the show interface serial 0 command issued on a DTE router, which OSI layer is
most likely source of the problem?
A. Physical layer
B. Data layer
C. Network layer
D. Transport layer