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题目内容
（请给出正确答案）
A.public
B.private
C.local area
D.wide area
答案
更多“Virtual Private Networks（VPN) are networks deployed on a （) network infrastructure.A”相关的问题
第2题
从供选择的答案中，选出最确切的解答。
SOCKS is a generic proxy protocol for ICP/IP-based networking, applications. SOCKS includes two(1), the SOCKS server and the SOCKS client. The SOCKS server is implemented at the application layer. The SOCKS client is implemented between applications and the(2)layer. When an application client needs to connect to an application server, the client connects to a SOCKS proxy server. The proxy server connects to the application server instead of the client, and(3)data between the client and the application server. For the application server, the proxy server is the(4). SOCKS is also one of the popular(5)to network firewalls. Because of its simplicity and flexibility, SOCKS has been used as generic application proxy in virtual private network (VPN), and for extranet applications.
第3题
选出应填入下面一段英语中______内的正确答案。
Public Key Infrastructure (PKI) service providers offer organizations fully integrated PKI-managed services designed to secure Intranet, Extranet, Virtual Private Network (VPN), and e-commerce applications. PKI solutions can enable a number of security services, including strong authentication and non-repudiation oftransaction.
eToken enables the users of PKI systems to generate and store(1)and digital certifications inside the token, creating a secure environment and allowing full portability and maximum ease of use. eToken Pro can also perfonn sensitive on-chip(2)operations, ensuring that users' keys are never exposed to PC environment, eToken eliminates the need to store(3)and keys on a hard disk or browser file, or to transmit them across the Internet/Extranet, assuring peace-of-mind and confidence during online communications.
A digital signature is created using the private key of an individual to ensure the validity of his request. This technology can be used to guarantee(4)of various transactions. The strength of either the authentication level or the digital signature relies on the level of protection offered to the private key. eToken PRO offers the maximum level of security, since it enables the use of the private key for signing and authenticating inside the eToken.
The most secure use of authentication involves enclosing at least one certificate with every signed message. The message(5)verifies the certificate using the CA's public key. If the sender's public key is legitimate, the recipient verifies the message's signature. Digital signatures created with a private key are verified with the digital certificate containing the public key.
第4题
We can infer that current virtual reality devices ______.
A．still need improving to create a perfect virtual world
B．are already perfect to create a virtual world
C．are unable to create a virtual world
D．are harmful to users of virtual reality
