Which VoIP components can permit or deny a call attempt on the basis of a network’s available bandwidth？（）

单项选择题WhatistheobjectiveofDiffie-Hellman？（）

A.used to verify the identity of the peer
B.used between the initiator and the responder to establish a basic security policy
C.used to establish a symmetric shared key via a public key exchange process
D.used for asymmetric public key encryption

单项选择题WhichtypeofMACaddressisdynamicallylearnedbyaswitchportandthenaddedtotheswitch’srunningconfiguration？（）

A.Static secure MAC address
B.Dynamic secure MAC address
C.Pervasive secure MAC address
D.Sticky secure MAC address

单项选择题AsanetworkengineeratCertpaper.com，youareresponsibleforCertpapernetwork.WhichwillbenecessarilytakenintoconsiderationwhenimplementingSyslogginginyournetwork？（）

A.Enable the highest level of Syslogging available to ensure you log all possible event messages
B.Use SSH to access your Syslog information
C.Log all messages to the system buffer so that they can be displayed when accessing the router
D.Syncronize clocks on the network with a protocol such as Network Time Protocol

单项选择题Refer to the exhibit. Based on the VPN connection shown， which statement is true？（）

A.Traffic that matches access list 103 will be protected
B.This VPN configuration will not work because the tunnel IP and peer IP are the same
C.The tunnel is down because the transform set needs to include the Authentication Header parameter
D.The tunnel is down as result of being a static rule. It should be configured as a Dynamic IPsec policy

单项选择题Forthefollowingitems，whichoneactsasaVPNterminationdeviceandislocatedataprimarynetworklocation？（）

A.Broadband service
B.Headend VPN device
C.VPN access device
D.Tunnel