下列不合法的C语言用户标识符是______。A．My_nameB．numlC．worldD．21strA．B．C．D．

A.Definetheencapsulationtype.

B.Definethestandbyrouter.

C.DefinethestandbyIPaddress.

D.Enablethestandbypriority.

A.S1(config)# interface fastethernet 0/1S1(config - if)# ip helper - address 10.0.0.2

B.S1(config)# interface fastethernet 0/1 S1(config - if)# ip helper - address 20.0.0.1

C.R1(config)# interface fastethernet 0/0 R1(config - if)# ip help er - address 20.0.0.2R 1(config - if)# ip helper - address 20.0.0.3 R1(config - if)# ip helper - address 20.0.0.4 R1(config - if)# exit R1(config)# interface fastethernet 0/1 R1(config - if)# ip helper - address 10.0.0.1

D.R1(config)# interface fastethernet 0/0 R1 (config - if)# ip helper - address 20.0.0.1 R2(config)# interface fastethernet 0/0 R2(config - if)# ip helper - address 20.0.0.1 R3(config)# interface fastethernet 0/0 R3(config - if)# ip helper - address 20.0.0.1 R4(config)# interface fastethernet 0/0 R4(config - if)# ip helper - address 20.0.0.1

E.S1(config)# interface fastethernet 0/1 S1(config - if)# ip helper - address 10.0.0.2 R2(config)# interface fastethernet 0/0 R2(config - if)# ip helper - address 20.0.0.1 R3(config)# interface fastethernet 0/0 R3(config - if) # ip helper - address 20.0.0.1 R4(config)# interface fastethernet 0/0 R4(config - if)# ip helper - address 20.0.0.1

A.TACACS

B.Telnet

C.SMTP

D.SNMP

E.HTTP

F.TFTP

Refertotheexhibit.HSRPhasbeenconfiguredandLinkAistheprimaryroutetorouterR4.WhenLinkAfails，routerR2（LinkB）becomestheactiverouter.WhichrouterwillassumetheactiverolewhenLinkAbecomesoperationalagain？"（）

A.TheprimaryrouterR1willreassumetheactiverolewhenitcomesbackonline.

B.ThestandbyrouterR2willremainactiveandwillforwardtheactiveroletorouterR1onlyintheeventofitsownfailure.

C.ThestandbyrouterR2willremainactiveandwillforwardtheactiveroletorouterR1onlyintheeventofLinkBfailure.

D.ThethirdmemberoftheHSRPgroup，routerR3，willtakeovertheactiveroleonlyineventofrouterR2failure.

A. It is a route to be used when the routing protocol fails.

B. It is a route configured by an ISP that sends traffic into a corporate network.

C. It is a route used when a packet is destined for a remote network that is not listed in the routing table.

D. It is a route manually configured for a specific remote network for which a routing protocol is not configured.

E. It is used to send traffic to a stub network.

A.ThehostAdefaultgatewayhasbeenconfiguredas10.88.1.10/24.

B.TheGLBPweightedloadbalancingmodehasbeenconfigured.

C.TheGLBPround-robin，load-balancingmodehasbeenconfigured.

D.TheGLBPhost-dependent，load-balancingmodehasbeenconfigured.

E.ThehostAdefaultgatewayhasbeenconfiguredas10.88.1.1/24.

F.ThehostAdefaultgatewayhasbeenconfiguredas10.88.1.4/24.

A.图案填充

B.纹理填充

C.交互式网格填充

D.PostScript纹理填充

A. They establish routes that will never go down.

B. The keep routing tables small.

C. They require a great deal of CPU power.

D. The allow connectivity to remote networks that are not in the routing table.

E. They direct traffic from the Internet into corporate networks.

A.图案填充

B.纹理填充

C.交互式网格填充

D.PostScript纹理填充

A. Information learned from one source is not distributed back to that source.

B. Routing updates from the poisoned source are ignored until a holddown timer expires.

C. Failed routes are advertised with infinite metrics.

D. New routing updates are ignored until the network has converged.

E. A route is marked as unavailable when its time-to-live is exceeded.