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A, B, C and E are incorrect; due to the fact that each workstation is connected to it’s own 10 Mbps port, each port can provided it full 10 mbps.
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
Q. 143
Which two WAN data link layer protocols support multiple upper layer protocols? (Choose Two)
A.PPP
B.LAPD
C.ISDN
D.HDLC
Answer: A, D
Explanation: Cisco has a proprietary HDLC. This Cisco HDLC frame uses a proprietary type field that acts as protocol field, which makes it possible for multiple network later protocols to share the same serial link.
PPPis not a proprietary protocol. As result, it is most often used to connect devices of different vendors. In addition, it encapsulate network layer protocol information that makes it possible to support multiple upper layer protocols.
Incorrect Answers:
B is incorrect; LAPB is a layer 2 protocol but LAPD is not
C is incorrect; ISDN is a Layer 1 (Physical) layer protocol, not Layer 2(data link).
Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages
Q. 144
Which command enables directly connected network 199.55.72.0 to be used by RIP?
A.Router(Config)# rip 199.55.0.0
B.
C.
D.
Answer: D
Explanation: The network command allows the routing process to identify the interfaces will participate in the sending and receiving of messages.
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