單項選擇題Which statement is true about a worm attack？（）

A.Human interaction is required to facilitate the spread.
B.The worm executes arbitrary code and installs copies of itself in the memory of the infected computer.
C.Extremely large volumes of requests are sent over a network or over the Internet.
D.Data or commands are injected into an existing stream of data. That stream is passed between a client and server application.


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1.單項選擇題Which statement is true when ICMP echo and echo-reply are disabled on edge devices？（）

A.Pings are allowed only to specific devices.
B.CDP information is not exchanged.
C.Port scans can no longer be run.
D.Some network diagnostic data is lost.
E.Wireless devices need to be physically connected to the edge device.
F.OSPF routing needs the command ip ospf network non-broadcast enabled.

2.多項選擇題What are the four fields in an MPLS label？（）

A.version
B.experimental
C.label
D.protocol
E.TTL
F.bottom-of-stack indicato

3.多項選擇題Which three statements are true when configuring Cisco IOS Firewall features using the SDM？ （）

A.A custom application security policy can be configured in the Advanced Firewall Security Configuration dialog box.
B.An optional DMZ interface can be specified in the Advanced Firewall Interface Configuration dialog box.
C.Custom application policies for e-mail， instant messaging， HTTP， and peer-to-peer services can be created using the Intermediate Firewall wizard.
D.Only the outside （untrusted） interface is specified in the Basic Firewall Interface Configuration dialog box.
E.The outside interface that SDM can be launched from is configured in the Configuring Firewall for Remote Access dialog box.
F.The SDM provides a basic， intermediate， and advanced firewall wizard.

5.多項選擇題

Refer to the exhibit.

Which three statements describe the steps that are required to configure an IPsec site-to-site VPN using a GRE tunnel？（）

A.The command access-list 110 permit gre must be configured to specify which traffic will be encrypted.
B.The command access-list 110 permit ip must be configured to specify which hosts can use the tunnel.
C.The tunnel destination 172.17.63.18 command must be configured on the Tunnel0 interface.
D.The tunnel mode gre command must be configured on the Tunnel0 interface.
E.The tunnel source Ethernet1 command must be configured on the Tunnel0 interface.
F.The tunnel source Tunnel0 command must be configured on the Tunnel0 interface.