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Question ID 18569

Which two features are supported when Cisco HDLC is implemented? (Choose two.)

Option A

 error recovery

Option B

 error detection

Option C

asynchronous links

Option D

 multiple protocols

Correct Answer B,D
Explanation Explanation: HDLCs frame check sequence (FCS) is a 16-bit CRC-CCITT or a 32-bit CRC-32 computed over the Address, Control, and Information fields. It provides a means by which the receiver can detect errors that may have been induced during the transmission of the frame, such as lost bits, flipped bits, and extraneous bits. Ciscos HDLC contains a proprietary field that is used to support multiple protocols. Reference: http://en.wikipedia.org/wiki/High-Level_Data_Link_Control


Question ID 18570

Which switching technology can be used to solve reliability problems in a switched
network?

Option A

fragment-free mode

Option B

cut-through mode

Option C

 check mode

Option D

 store-and-forward mode

Option F

Answer : D

Explanation: Characteristics of Store-and-Forward Ethernet Switching This section provides an overview of the functions and features of store-and-forward Ethernet switches. Error Checking Figure 1 shows a store-and-forward switch receiving an Ethernet frame in its entirety. At the end of that frame, the switch will compare the last field of the datagram against its own frame-check-sequence (FCS) calculations, to help ensure that the packet is free of physical and data-link errors. The switch then performs the forwarding process. Whereas a store-and-forward switch solves reliability issues by dropping invalid packets, cut-through devices forward them because they do not get a chance to evaluate the FCS before transmitting the packet. Figure 1. Ethernet Frame Entering a Store-and-Forward Bridge or Switch (from Left to Right)

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5020- switch/white_paper_c11-465436.html

Correct Answer F
Explanation

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