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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1.多項選擇題使用ACL可以減少哪些攻擊()

A.拒絕服務器攻擊
B.IP地址欺騙
C.DOS TCP SYN攻擊
D.DOS smurf攻擊

3.多項選擇題相對標準和靜態(tài)擴展ACL,動態(tài)ACL有哪些優(yōu)勢()

A.每個用戶的挑戰(zhàn)驗證機制
B.簡化路由器對ACL的處理
C.降低網絡黑客對網絡的攻擊機會
D.在不損害其他安全配置的前提下,可以動態(tài)的讓用戶穿越防火墻

4.單項選擇題Which component of VPN technology ensures that data can be read only by its intended recipient?()

A.data integrity
B.encryption
C.key exchange
D.authentication

5.多項選擇題Which router IOS commands can be used to troubleshoot LAN connectivity problems?()

A.ping
B.tracert
C.ipconfig
D.show ip route
E.winipcfg
F.show interfaces