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多項(xiàng)選擇題哪三種說法準(zhǔn)確描述2層以太網(wǎng)交換機(jī)？（）

A.微分割減小了網(wǎng)絡(luò)上的沖突次數(shù)。
B.如果交換機(jī)收到一個(gè)幀一個(gè)未知的目的地，它使用ARP解析地址。
C.生成樹協(xié)議允許交換機(jī)自動(dòng)共享VLAN信息。
D.在一個(gè)功能正常的網(wǎng)絡(luò)冗余的交換路徑，每個(gè)交換環(huán)節(jié)將包含其轉(zhuǎn)發(fā)狀態(tài)的所有端口一個(gè)根橋。在廣播域中所有其它交換機(jī)將只有一個(gè)根端口。
E.建立的VLAN增加廣播域的數(shù)量。
F.配置有VLAN的交換機(jī)使基于第2層和第3層地址信息轉(zhuǎn)發(fā)決策。

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1.單項(xiàng)選擇題How does using the service password encryption command on a router provide additional security?（）

A.by encrypting all passwords passing through the router
B.by encrypting passwords in the plain text configuration file
C.by requiring entry of encrypted passwords for access to the device
D.by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges
E.by automatically suggesting encrypted passwords for use in configuring the router

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2.多項(xiàng)選擇題What two statistics appear in show frame-relay map output?（）

A.The number of FECN packets that are received by the router
B.The number of BECN packets that are received by the router
C.The ip address of the local router
D.The value of the local DLCI
E.The status of the PVC that is configured on the router

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3.多項(xiàng)選擇題 請(qǐng)參見圖示，如果集線器分別被替換為配置了一個(gè)以太網(wǎng)VLAN交換機(jī)，結(jié)果會(huì)發(fā)生什么？（）

A.沖突域的數(shù)量會(huì)減少。
B.沖突域的數(shù)量將增加。
C.廣播域的數(shù)量將保持不變。
D.沖突域的數(shù)量將保持不變。
E.廣播域的數(shù)量將增加。

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4.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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5.多項(xiàng)選擇題 Refer to the exhibit.Which three statements correctly describe Network Device A？（）

A.With a network wide mask of 255.255.255.128， each interface does not require an IP address.
B.With a network wide mask of 255.255.255.128， each interface does require an IP address on a unique IP subnet.
C.With a network wide mask of 255.255.255.0， must be a Layer 2 device for the PCs to communicate with each other.
D.With a network wide mask of 255.255.255.0， must be a Layer 3 device for the PCs to communicate with each other.
E.With a network wide mask of 255.255.254.0， each interface does not require an IP address.

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