單項(xiàng)選擇題In a brute-force attack, what percentage of the keyspace must an attacker generally search through until heor she finds the key that decrypts the data?()

A.Roughly 50 percent
B.Roughly 66 percent  ActualTests.com
C.Roughly 75 percent
D.Roughly 10 percent


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1.單項(xiàng)選擇題When configuring role-based CLI on a Cisco router,which action will be taken first ?()

A.Create a parser view called "root view."
B.Log in to the router as the root user.
C.Enable the root view on the router.
D.Enable role-based CLI globally on the router using the privileged EXEC mode Cisco IOS command.

3.單項(xiàng)選擇題For the following options, which feature is the foundation of Cisco Self-Defending Network technology?()

A.secure network platform
B.secure connectivity
C.threat control and containment
D.policy management

4.單項(xiàng)選擇題During role-based CLI configuration, what must be enabled before any user views can be created?()

A.multiple privilege levels
B.usernames and passwords
C.aaa new-model command
D.secret password for the root user
E.HTTP and/or HTTPS server

6.單項(xiàng)選擇題Which information is stored in the stateful session flow table while using a stateful firewall?()

A.the inside private IP address and the translated inside global IP address
B.the source and destination IP addresses, port numbers,TCP sequencing information, and additional flags for each TCP or UDP connection associated with a particular session
C.the outbound and inbound access rules (ACL entries)
D.all TCP and UDP header information only

7.單項(xiàng)選擇題In an IEEE 802.1x deployment,between which two devices EAPOL messages typically are sent?()

A.Between the supplicant and the authenticator
B.Between the authenticator and the authentication server
C.Between the supplicant and the authentication server
D.Between the RADIUS server and the authenticator

8.單項(xiàng)選擇題Regarding constructing a good encryption algorithm, what does creating an avalanche effect indicate?()

A.Altering the key length causes the ciphertext to be completely different
B.Changing only a few bits of a ciphertext message causes the plain text to be completely different
C.Altering the key length causes the plain text to be completely different
D.Changing only a few bits of a plain-text message causes the ciphertext to be completely different

9.單項(xiàng)選擇題What is a static packet-filtering firewall used for ?()

A.It validates the fact that a packet is either a connection request or a data packet belonging to a connection
B.It evaluates network packets for valid data at the application layer before allowing connections
C.It analyzes network traffic at the network and transport protocol layers
D.It keeps track of the actual communication process through the use of a state table

10.單項(xiàng)選擇題Which one of the aaa accounting commands can be used to enable logging of both the start and stoprecords for user terminal sessions on the router?()

A.aaa accounting connection start-stop tacacs+
B.aaa accounting exec start-stop tacacs+
C.aaa accounting system start-stop tacacs+
D.aaa accounting network start-stop tacacs+

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