Which information is carried in an OSPFv3 intra-area-prefix LSA？ （）

单项选择题WhichofthesestatementsbestdescribesthemajordifferencebetweenanIPv4-compatibletunnelanda6to4tunnel？（）

A. An IPv4-compatible tunnel is a static tunnel， but an 6to4 tunnel is a semiautomatic tunnel.
B. The deployment of a IPv4-compatible tunnel requires a special code on the edge routers， but a 6to4 tunnel does not require any special code.
C. An IPv4-compatible tunnel is typically used only between two IPv6 domains， but a 6to4 tunnel is used to connect to connect two or more IPv6 domains.
D. For an IPv4-compatible tunnel， the ISP assigns only IPv4 addresses for each domain， but for a 6to4 tunnel， the ISP assigns only IPv6 addresses for each domain.

单项选择题YouareusingVTPversion2inyournetworktotransportVLANinformationbetweenswitches.When addingaswitchtothenetworkthathasbeenusedinthelabpreviously，younoticethatalotoftheexistingVLANshavebeendeletedorreplacedwithothernames.Whatcanyoudotopreventthisfromhappeninginthefuture，withoutlosingallVTPfeaturesthatyouareusingtoday？（）

A.configure a hard-to-guess VTP domain name
B.use a hard-to-guess VTP password
C.use VTP transparent mode
D.implement VTP version 3

单项选择题WhichofthesebestidentifiesthetypesofprefixesarouterrunningBGPwilladvertisetoanEBGPpeer？（）

A. prefixes received from any other BGP peer and prefixes locally originated via networkstatements or redistributed to BGP
B. all prefixes in its IP routing table
C. only prefixes received from EBGP peers and prefixes locally originated via network statements or redistributed
D. only prefixes received from EBGP peers and prefixes received from route reflectors
E. all prefixes in its routing table except the prefixes received from other EBGP peers
F. all prefixes in its routing table except the prefixes received from other IBGP peers

多项选择题Whentroubleshootingduplexmismatches，whichtwoareerrorsthataretypicallyseenonthehalfduplexend？（）

A.excessive collisions
B.FCS errors
C.runts
D.late collisions

单项选择题Whichconfigurationisusedtoenablerootguard？（）

A.interface gig3/1  spanning-tree guard root
B.interface gig3/1  spanning-tree root guard
C.interface gig3/1  spanning-tree root-guard
D.interface gig3/1  spanning-tree root-guard default