單項選擇題Which command enables IPv6 forwarding on a cisco router?()

A. ipv6 host
B. ipv6 unicast-routing
C. ipv6 local
D. ipv6 neighbor


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1.單項選擇題In the implementation of VLSM techniques on a network using a single Class C IP address,which subnet mask is the most efficient for point-to-point serial links?()

A. 255.255.255.240
B. 255.255.255.254
C. 255.255.255.252
D. 255.255.255.0
E. 255.255.255.248

2.單項選擇題Which IPv6 address is valid?()

A. 2031:0:130F::9C0:876A:130B
B. 2001:0DB8:0000:130F:0000:0000:08GC:140B
C. 2001:0DB8:0:130H::87C:140B
D. 2031::130F::9C0:876A:130B

3.單項選擇題Which of the following protocols uses both TCP and UDP ports?()

A. SMTP
B. Telnet
C. FTP
D. DNS

4.單項選擇題Which command enhances the 802.1D convergence time on ports that are connected to hosts?()

A. spanning-tree backbonefast
B. spanning-tree uplinkfast
C. spanning-tree portfast
D. spanning-tree cost512

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