Cisco Systems 2 manual Answer C Explanation, Which statement about Ethernet switches is true?

640 - 607

B.600 - 699

C.800 - 899

D.1000 - 1099

Answer: C

Explanation:

Access list exist for IPX traffic, just like they do with IP traffic. Like IP there are ranges for IPX access list. The IPX access list ranges are: 800 to 899 – standard access lists, 900 to 999 – extended access lists, and 1000 to 1099 – SAP filter access lists.

Incorrect Answers:

A is incorrect; 100-199 is the range for an extended ip access address.

C is incorrect; this is not a defined access list range.

D is incorrect; the range 1000-1099 is for SAP filter access list.

Steve McQuerry. Interconnecting Cisco Network Devices. (Cisco Press: 2000) pages 350-351 and 305.

Q. 172

Which statement about Ethernet switches is true?

A.Symmetric switching allows connection between ports of unlike bandwidth and does not require memory buffering.

B.Memory buffering is used to prevent a bottleneck when ports of different bandwidth are connected on a symmetric switch.

C.The latency can be reduced if the switch utilizes the store and forward method of switching. Store and forward is better for error detection.

D.The cut-trough method of switching is faster because the switch forwards the packet to the destination as soon as it reads the destination address.

Answer: D

Explanation: In cut-through mode, the switch checks the destination address (DA) as soon as the header is received and immediately begins forwarding the frame. Depending on the network transport protocol being used (connection or connectionless orientate), there is a significant decrease in latency from input port to output port. The delay in cut-through switching remains constant regardless of the size of the frame , because this switching mode starts to forward the frame as soon as the switch reads the DA.

Incorrect Answers:

A is incorrect; Symmetric switching provides evenly distributed bandwidth to each port, while asymmetric switching provides unlike, or unequal, bandwidth between some ports.

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