單項選擇題The enable secret password appears as an MD5 hash in a router’s configuration file， whereas the enablepassword is not hashed （or encrypted， if the password-encryption service is not enabled）. What is thereason that Cisco still support the use of both enable secret and enable passwords in a router’sconfiguration？（）

A.The enable password is present for backward compatibility.
B.Because the enable secret password is a hash， it cannot be decrypted. Therefore， the enable password is used to match the password that was entered， and the enable secret is used to verify that the enablepassword has not been modified since the hash was generated.
C.The enable password is considered to be a router’s public key， whereas the enable secret password is considered to be a router’s private key.
D.The enable password is used for IKE Phase I， whereas the enable secret password is used for IKE Phase II.


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1.單項選擇題

Which statement best describes the relationships between AAA function and TACACS+， RADIUS based onthe exhibit shown？（）

A.TACACS+ - P4S1 and P4S4RADIUS - P4S2 and P4S3
B.TACACS+ - P4S2 and P4S4RADIUS - P4S1 and P4S3
C.TACACS+ - P4S1 and P4S3Actual RADIUS - P4S2 and P4S4
D.TACACS+ - P4S2 and P4S3RADIUS - P4S1 and P4S4

2.單項選擇題What will be enabled by the scanning technology-The Dynamic Vector Streaming （DVS）？（）

A.Firmware-level virus detection
B.Signature-based virus filtering
C.Layer 4 virus detection
D.Signature-based spyware filtering

3.多項選擇題

Given the exhibit below. You are a network manager of your company. You are reading your Syslog serverreports. On the basis of the Syslog message shown， which two descriptions are correct？（）

A.This is a normal system-generated information message and does not require further investigation.
B.Service timestamps have been globally enabled.
C.This message is unimportant and can be ignored.
D.This message is a level 5 notification message.

4.單項選擇題If a switch is working in the fail-open mode， what will happen when the switch’s CAM table fills to capacityand a new frame arrives？（）

A.A copy of the frame is forwarded out all switch ports other than the port the frame was received on.
B.The frame is transmitted on the native VLAN.
C.The switch sends a NACK segment to the frame’s source MAC address.
D.The frame is dropped.

5.單項選擇題

Which description is true about the show login command output displayed in the exhibit？（）

A.Three or more login requests have failed within the last 100 seconds.
B.When the router goes into quiet mode， any host is permitted to access the router via Telnet，actual   SSH， and HTTP， since the quiet-mode access list has not been configured.
C.The login block-for command is configured to block login hosts for 93 seconds.
D.All logins from any sources are blocked for another 193 seconds.

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