Which of the following troubleshooting targets is considered to be a Layer 2 issue？（Choose allthat apply.）（）

A.Building schematic
B.IGP community elements
C.Listing of interconnections
D.Physical topology diagram
E.Logical topology diagram
F.Inventory of network equipment

A.An error will result because a router cannot be configured with an EIGRP variance of 3 becausethe maximum variance number is 2
B.The successor route will end up in the routing table， and so will any route with a metric at mostthree times greater than the value of the successor’s metric
C.EIGRP will only advertise routes that are within three hops of the current router
D.The successor route will end up in the routing table， and so will any route with a metric at leastone third the value of the successor’s metric
E.The best three routes with equal cost paths will end up in the routing table
F.The successor route will be any route with three times the value of the advertised distance

A.Several processes can exist simultaneously
B.Requires direct connectivity from the backbone area to all other areas
C.Has the same packet types
D.Can support multiple subnets on a single link
E.Uses a hierarchical structure divided into areas
F.Adjacencies formed with neighbors