出于安全考虑，网络管理员需要去防止外网主机PING内网，下面哪个协议应该用access control lists限制掉？（）A、IPB、ICMPC、TCPD、UDP
出于安全考虑，网络管理员需要去防止外网主机PING内网，下面哪个协议应该用access control lists限制掉？（）
- A、IP
- B、ICMP
- C、TCP
- D、UDP
相关考题：
What are two characteristics of the relationship between the Cisco PIN architecture and Cisco Validated Designs? （）(Choose two.)A、Cisco is focusing on Cisco Validated Designs as a means to driving integrated networks.B、Cisco is focusing on the PIN architecture as a means to driving integrated networks.C、The Cisco PIN architecture is a critical mechanism for supporting integrated markets because it can be implemented quickly.D、The Cisco Validated Designs program provides critical mechanisms for supporting integrated markets because the mechanisms can be implemented quickly.E、Cisco Validated Designs can be implemented quickly without customer input.
When verifying OSPF virtual link problems, which is an important item to check on the two transit OSPF routers?（）A、OSPF process IDB、OSPF router IDC、OSPF network typeD、OSPF memory usageE、OSPF CPU utilizationF、OSPF stub area configurations
When the AIM-CUE is being used, where do log messages go if the log file is full?（）A、The initial log file is named message.log.prev, and a new file named message.log is started. B、Once the log file is full, the oldest log entries are dropped to make space for new entries. C、When the log file becomes full, it is automatically copied to an external server and a new message.log file is started. D、Once the log file becomes full, it stops logging new messages and the new log messages are lost.
What are two ways to minimize the delay of VoIP packets that are traversing a network？（）A、Use WFQ， CBWFO， and LLO to prioritize delay-sensitive packetsB、Use WFO， CBWFO， and LLO to compress the payload.C、Give TCP packets priority over UDP packets.D、Use control plane policing for cRTP queuing.E、Use stacker and predictor to compress the payload.
What two features in Cisco switches help prevent Layer 2 loops？（）A、UniDirectional Link DetectionB、Hot Standby Router ProtocolC、Virtual Router Redundancy ProtocolD、PortFastE、root guardF、loop guard