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多項(xiàng)選擇題數(shù)字簽名在以下哪些場(chǎng)合使用（）

A.提供數(shù)據(jù)源的唯一證據(jù)
B.證明PKI證書的真實(shí)性和完整性
C.使用一個(gè)被信任的時(shí)間源來提供一個(gè)安全的時(shí)間戳
D.通過使用一個(gè)用戶的私鑰和它產(chǎn)生的簽名對(duì)該用戶進(jìn)行認(rèn)證

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1.單項(xiàng)選擇題Refer to the exhibt.Host A has tested connectivity to a remote network.What is the default gateway for host A?（）

A.172.16.182.1
B.192.168.1.1
C.10.16.176.1
D.192.168.1.6

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2.多項(xiàng)選擇題What are two characteristics of a switch that is configured as a VTP client？（）

A.if a switch that is configured to operate in client mode cannot access a VTP server，then the switch reverts to transparent mode.
B.The local vlan configuration is updated only when an update that has a higher configuration revision number is received.
C.Vtp advertisements are not forwarded to neighboring switches that are configured in vtp transparent mode.
D.When switches in vtp client mode are rebooted，they send a vtp advertisement request to the vtp servers.
E.Vtp client is the default vtp mode
F.On switches that are configured to operate in client mode ，vlans can be created，deleted，or renamed locally

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3.多項(xiàng)選擇題下列哪些算法是非對(duì)稱密鑰算法（）

A.IKE
B.安全套階層
C.SSH
D.PGP

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4.單項(xiàng)選擇題What is the OSPF default frequency,in seconds,at which a cisco router sends hello packets on a multiaccess network?（）

A.10
B.40
C.30
D.20

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5.單項(xiàng)選擇題Which dose the frame-relay interface-dlci command configure?（）

A.remote DLCI on the main interface
B.local DLCI on the main interface
C.local DLCI on the subinterface
D.remote DLCI on the subinterface

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