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單項(xiàng)選擇題

Which of the following are suitable protocols for securing VPN connections at the lower layers of the OSI model?在OSI的低層模型中，以下哪項(xiàng)協(xié)議適合用于VPN的安全連接（）

A. PKCS#10 and X.509
B. TLS and SSL
C. IPsec and L2TP
D. S/MIME and SSH

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單項(xiàng)選擇題

The standard server port number for HTTP is which of the following?HTTP協(xié)議的標(biāo)準(zhǔn)端口是以下哪一個(gè)？（）

A.81
B.8180
C.8080
D.80

單項(xiàng)選擇題

Which tunneling protocol can be described by these characteristics: 1) Handles multiple connections at the same time, 2) Provides secure authtentication and encryption, 3) Supports only IP networks, 4) Used to be focused mostly on LAN-to-LAN communication rather than dial-up protocol, 5) Works at the network layer and provides security on top of IP.以下選項(xiàng)中，那個(gè)隧道協(xié)議可以被描述為以下特點(diǎn)1.同一時(shí)間處理多個(gè)連接 2.提供安全認(rèn)證和加密3.僅支持IP網(wǎng)絡(luò)4.主要用于局域網(wǎng)到局域網(wǎng)的通信5.工作在網(wǎng)絡(luò)層以及提供IP安全（）

A.Hybrid L2PP
B.IPSec
C.L2F
D.L2TP