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單項選擇題What is the first 24 bits in a MAC address called?（）

A.NIC
B.BIA
C.OUI
D.VAI

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1.多項選擇題為了獲得更好的虛擬登錄連接的安全性，應配置以下哪些參數(shù)（）

A.兩次成功登錄之間的延遲
B.如果檢測到DoS攻擊，應關閉登錄
C.加密所有密碼
D.為登錄建立系統(tǒng)日志

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2.單項選擇題 which address range efficiently summarizes the routing table of the addresses for router main？（）

A.172.16.0.0/18
B.172.16.0.0/16
C.172.16.0.0/20
D.172.16.0.0/21

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3.單項選擇題When is it necessary to use a public IP address on a routing interface?（）

A.Connect a router on a local network.
B.Connect a router to another router.
C.Allow distribution of routes between networks.
D.Translate a private IP address.
E.Connect a network to the Internet.

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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

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5.單項選擇題What will happen if a private IP address is assigned to a public interface connected to an ISP?（）

A.Addresses in a private range will be not routed on the Internet backbone.
B.Only the ISP router will have the capability to access the public network.
C.The NAT process will be used to translate this address in a valid IP address.
D.Several automated methods will be necessary on the private network.
E.A conflict of IP addresses happens, because other public routers can use the same range.

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