单选题What is the port number of an IPsec Encapsulating Security Payfoad packet？（）A UOP port 50B IP protocol 51C TCP port 51D TCP port 50E IP protocol 50F UDP port51

第1题：

What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology？（）

• A、lowest port MAC address
• B、port priority number and MAC address
• C、VTP revision number
• D、highest port priority number
• E、path cost

第2题：

IPSec VPN is a widely-acknowledged solution for enterprise network. Which three IPsec VPNstatements are true？（）

• A、IKE keepalives are unidirectional and sent every ten seconds
• B、IPsec uses the Encapsulating Security Protocol （ESP） or the Authentication Header （AH）protocol for exchanging keys
• C、To establish IKE SA, main mode utilizes six packets while aggressive mode utilizes only threepackets
• D、IKE uses the Diffie-Hellman algorithm to generate symmetrical keys to be used by IPsec peers

第3题：

What is the port number of an IPsec Encapsulating Security Payfoad packet？（）

• A、UOP port 50
• B、IP protocol 51
• C、TCP port 51
• D、TCP port 50
• E、IP protocol 50
• F、UDP port51

第4题：

What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?（）

• A、lowest port MAC address
• B、port priority number and MAC address.
• C、VTP revision number
• D、highest port priority number.
• E、path cost

第5题：

The voice VLAN feature has been enabled on a new Company Catalyst switch port.  What is the  effect of this？ （）

• A、The CoS is trusted for 802.1P or 802.1Q tagged traffic.
• B、PortFast is disabled on the port.
• C、Port Security is automatically enabled on a voice VLAN port.
• D、Untagged traffic is sent according to the default CoS priority of the port.
• E、None of the other alternatives apply

第6题：

What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-treetopology?（）

• A、lowest port MAC address
• B、port priority number and MAC address.
• C、VTP revision number
• D、highest port priority number.
• E、pathcost

第7题：

What value is primarily used to determine which port becomes the root port on each non root switch in a spanning-tree topology?（）

• A、path cost
• B、lowest port MAC address
• C、VTP revision number
• D、highest port priority number
• E、port priority number and MAC address

第8题：

What is the port number of the IPsec Authentication Header packet？（）

• A、IP protocol 50
• B、TCP port 51
• C、UDP port 50
• D、IP protocol 51
• E、UDP port 51
• F、TCP port 50

第9题：

What does the number one 1 represent for interface fe-0/0/1？（）

• A、port number
• B、PCI slot number
• C、channel number
• D、virtual PIC number

第10题：

What is the port number of an IPsec Encapsulating Security Payload packet？（）

• A、IP protocol 50
• B、IP protocol 51
• C、TCP port 50
• D、TCP port 51
• E、UDP port 50
• F、UDP port 51