从给出的几句话中选出没有语病的一句（)。A．尽管我们少年时代的条件如何艰苦，但是我们仍然坚持学

A.the port-channel 1 interface

B.the highest number member interface

C.all member interfaces

D.the lowest number member interface

A. when they receive a special token

B. when there is a carrier

C. when they detect no other devices are sending

D. when the medium is idle

E. when the server grants access

A.AftertheLayer3headerandbeforeLayer2header

B.AftertheLayer2headerandbeforeLayer3header

C.WithintheLayer3header

D.Beforethelayer2header

A.speed

B.DTP negotiation settings

C.trunk encapsulation

D.duplex

A.Cisco

B.ANSI-Annex D

C.Q.931-Annex B

D.Q.933-Annex A

A.AnHTTPSDFfilelocationcanbespecifiedbyclickingtheAddbutton.

B.IfallspecifiedSDFlocationsfailtoload，thesignaturefilethatisnameddefault.sdfwillbeloaded.

C.TheAutosavefeatureautomaticallysavestheSDFalarmsiftheroutercrashes.

D.TheAutosavefeatureisautomaticallyenabledforthedefaultbuilt-insignaturefile.

E.Thenameofthebuilt-insignaturefileisdefault.sdf.

F.TheUseBuilt-InSignatures（asbackup）checkboxisselectedbydefault.

A.HMAC-MD5

B.HMAC-SHA

C.CBC-DES

D.community strings

A. Create an additional ACL to block the access to VLAN 1.

B. Move the management VLAN to something other than default.

C. Move all ports to another VLAN and deactivate the default VLAN.

D. Limit the access in the switch using port security configuration.

E. Use static VLAN in trunks and access ports to restrict connections.

F. Shutdown all unused ports in the Catalyst switch.