Which of the following protocol layers is the security protection of communication system implemented? ( )
A: NAS
B: HTTP
C: PDCP
D: FTP
A: NAS
B: HTTP
C: PDCP
D: FTP
举一反三
- 中国大学MOOC: Dangers of a poorly implemented performance management system include which of the following:
- Which one is true according to the communication protocol?
- Which of the following is not a future challenge for maritime transportation? A: Safety and security B: System capacity C: Finance and economics D: Transport demand
- In which year was the National Health Service system implemented comprehensively?
- VPN技术采用的隧道协议包括 A: PPTP（Point to Point Tunneling Protocol) B: L2TP (Layer 2 Tunneling Protocol) C: IPSec (Internet Protocol Security) D: HTTP (Hyper Text Transfer Protocol over SecureSocket Layer)