Which BGP community is used to prevent the advertisement of the BGP prefix to other BGP peers？（）

A . To influence the choice of best path (best route) for at least some routes B . To avoid having to configure static routes C . To allow redistribution of BGP routes into the IGP routing protocol D . To monitor the size of the Internet BGP table

A . On the CE router, PE neighbors must be configured in the VRF context on the CE router B . On PE routers, the CE IBGP neighbors are configured in the global BGP configuration C . On PE routers, the CE EBGP neighbors are configured in the VRF context D . A separate BGP process must be used on the PE routers for CE routers so that they do not use the same BGP routing process as that used for the PE router's other provider neighbor

A . Weight B . Origin code C . AS_Path D . Local_Pref

A . by tracking the status of objects along the path to the e-commerce module B . by detecting undesirable conditions along the path to the e-commerce module C . by using the MED to communicate the site preferences for traffic to multiple ISPs D . by communicating the available prefixes， routing policies， and preferences of each site to its ISP E . by moving the SLB to a position where selected traffic to and from the servers does not go through the SLB

A . 正确 B . 错误

A . origin B . router-ID C . AS-path D . local-preference E . next-ho

A .  It communicates with all other community ports in the private VLAN domain. B .  It communicates with only isolated ports in the private VLAN domain. C .  It communicates only with other community ports in the same community and associated promiscuous ports. D .  It communicates only with associated promiscuous and isolated ports.

A . MD5 has been used by BGP to encrypt BGP update packets. B . BGP uses a message-digest algorithm to authenticate BGP peers C . A plain-text password authentication is an option of BGP authentication D . EBGP peers authentication is faster than IBGP peers authentication E . BGP uses public key and private key to authenticate BGP peers.

A . debug ip bgp updates B . debug ip tcp events C . debug ip bgp transactions D . debug ip tcp transactio

A . soft - reconfiguration B . route refresh C . BGP communities D . full - mesh BGP peering

A . BGP uses TCP port 179. B . BGP ensures reliability of updates by using the reliable transport services of TCP. C . The network command with the mask option never insta lls a prefix into the BGP table unless there is a matching prefix exists in the IP route table. D . A TCP connection is required before exchanging updates. E . BGPuses notification and the update messages to establish and maintain the BGP neighbor relati onship.

A . AS - path B . next - hop C . MED D . weight E . local preference F . origi

A . Following a link flap in the BGP speaker’s AS B . During initial convergence. C . Following a Route Processor Switchover. D . Just before sending a CEASE message to tear down the session. E . During capability negotiatio

A . weight B . MED C . local preference D . origin E . next - hop F . AS - path

A . Site Of Origin SOO B . Route-Target C . Route-Distinguisher D . Domain Identifier BGP extended commumity

A . NO-EXPORT B . NO-ADVERTISE C . LOCAL-AS D . INTERNET

A . show ip bgp ipv6 B . show protocols ipv6 C . show ipv6 bgp D . show bgp ipv6

B、no_advertise C、internet D、no_internet

87. For example, electronic communication filters out and alters much of the subtlety, warmth, contextuality, and so on that seem important to fully human, morally engaged interaction. That is one reason many Japanese and European executives persist in considering face-to-face encounter essential to their business dealings and why many engineers, too, prefer face-to-face encounter and find it essential to their creativity. 88. Even hypothetical new media (e. g. advanced "virtual realities"), conveying a dimensionally richer sensory display are unlikely to prove fully satisfactory, substitutes for face-to-face interaction. Electronic media decompose holistic experience into analytically distinct sensory dimensions and then transmit the latter. At the receiving end, people can resynthesize the resulting parts into a coherent experience, but the new whole is invariably different and, in some fundamental sense, less than the original. Second, there is evidence that screen-based technologies (such as TV and computer monitors) are prone to induce democratically unpromising psychopathologies, ranging from escapism to passivity, obsession, confusing watching with doing, withdrawal from other forms of social engagement, or distancing from moral consequences. Third, a strength--but also a drawback--to a virtual community is that any member can exit instantly. Indeed, an entire virtual community can decline or perish in the wink of an eye. 89. To the extent that membership in virtual communities proves less stable than that obtaining in other forms of democratic community, or that social relations prove less thick (i. e. less embedded in a context filled with shared meaning and history), there could be adverse consequences for individual psychological and moral development. 90. no matter with whom we communicate or how far our imaginations fly, our bodies--and hence many material interdependencies with other people--always remain locally situated. Thus it seems morally hazardous to commune with far-flung tele-mates, if that means growing indifferent to physical neighbors. It is not encouraging to observe just such indifference in California's Silicon Valley, one of the world's most "highly wired" regions. (66)