CCIE系列認(rèn)證章節(jié)練習(xí)(2019.05.07)

A.239.0.0.1
B.239.255.255.255
C.224.0.0.10
D.224.0.0.5

A.512 bits
B.768 bits
C.1024 bits
D.2048 bits

A.source IP address
B.destination IP address
C.per-packet load balance
D.destination MAC address
E.source MAC address

A. Designated Root Cost
B. bridge ID priority
C. max age
D. bridge ID MAC address
E. Designated Root Priority
F. forward delay

A. Full DNS functionality as a replacement of a DNS
B. Responds to a DNS query with A-record
C. Forwards queries to a name server
D. Multiple A-records
E. DHCP functionality for the local hosts

A.A priority of 0 will prevent a router from becoming a DIS.
B.If the DIS becomes unavailable the backup DIS is promoted to DIS.
C.Adding a router with a higher priority than the current DIS will result in the new router becoming DIS.
D.Separate L1 and L2 election processes are held on a brodcast network.
E.L1 routers on a broadcast network only establish adjacencies with the DIS.
F.If there is a tie based on priority，the router whose attached interface has the lowest MAC address becomes the DIS.