单项选择题

CiscoExpressForwarding（CEF）ismainlyusedtoincreasepacket……

Cisco Express Forwarding （CEF） is mainly used to increase packet switching speed， reducing theoverhead and delays introduced by other routing techniques， increasing overall performance.Which of the following concerning CEF is recommended by Cisco？（）

A. Use default Layer 4 hash in core.
B. Use default Layer 3 hash in distribution.
C. Use default Layer 4 hash in distribution.
D. Use default Layer 3 hash in core and Layer 3 + Layer 4 hash in distribution layer.

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多项选择题Whichthreestatementsaboutfirewallmodesarecorrect？（）

A. A firewall in routed mode has one IP address
B. A firewall in transparent mode has one IP address
C. In routed mode， the firewall is considered to be a Layer 2 dew
D. In routed mode， the firewall is considered to be a Layer 3 device
E. In transparent mode， the firewall is considered to be a Layer 2 device
F. In transparent mode， the firewall is considered to be a Layer 3 device

单项选择题Refer to the exhibit. Which of the following is an advantage of device clustering utilizing Virtual Port Channels （vPC）？（）

A. A logical star topology provides a loop free environment so that all links will be used forwardtraffic
B. Enhanced EtherChannel hashing load balancing using the vPC peer link internal to the VPC
C. The control plane functions of the Nexus switches are merged to hide the use of virtualization
D. Neighboring devices connect on a Layer 3 MEC for improved packet forwarding

单项选择题WhichofthesestatementsaboutFSPFistrue？（）

A. It supports multipath routing
B. It can run any type of storage ports
C. When it is used， hop-by-hop routes are based only on the switch ID
D. When it is used， path status is based on the functionality of attached ports
E. It runs only on a switch fabric and cannot function in a VSAN

多项选择题WhichofthefollowingtwostatementsaboutCiscoNSFandSSOarethemostrelevanttothenetworkdesigner？（）

A. You can reduce outage 1 to 3 seconds by using SSO in Layer 2 environment or Cisco NSF with SSO in a Layer 3 environment.
B. SSO and NSF each require the device to either be graceful restart-capable or graceful-aware.
C. In a fully redundant topology adding redundant supervisor a with NSF and SSO may causelonger convergence times than single supervisors with turned IGP times
D. The primary deployment scenario for Cisco NSF with SSO is in the Distribution and Corelayers.
E. Cisco NSF-aware neighbor relationship are independent of any turned IGP times

单项选择题WhatistherecommendedpracticeregardingUDLDwhenimplementingitinallfiber-opticLANports？（）

A. Adjust the default hello timers to three seconds for aggressive mode
B. Enable it in global mode and on every interface you need to support
C. Enable it in global mode to support every individual fiber-optic interface
D. Enable it to create channels containing up to eight parallel links between switches