2. 计算机
  3. Which of the protocols below use TCP at the transport layer? (Select four) A. TFTP B. SMTP C. SNMP D. FTP E. HTTP F. HTTPS

Which of the protocols below use TCP at the transport layer? (Select four) A. TFTP B. SMTP C. SNMP D. FTP E. HTTP F. HTTPS

admin2009-05-19  66
问题 Which of the protocols below use TCP at the transport layer? (Select four)
A. TFTP
B. SMTP
C. SNMP
D. FTP
E. HTTP
F. HTTPS
选项
答案B,D,E,F
解析 Explanation:
SMTP (Simple Mail Transfer Profile for email), FTP (File Transfer Protocol), and HTTP/HTTPS (Hyper Text Transfer Protocol for internet) all use TCP because of the reliable delivery mechanism. SMTP uses TCP port 25, FTP uses TCP ports 20 and 21, HTTP uses TCP port 80, and HTTPS uses TCP port 443.

Incorrect Answers:
A, C: SNMP and TFTP use UDP as the transport mechanism. Generally speaking, protocols that use the keywords "trivial" or "simple" uses UDP, since connectionless, best effort delivery mechanism usually suffice.
转载请注明原文地址:https://www.kaotiyun.com/show/w0hZ777K
本试题收录于： 思科640802题库思科认证分类
0

思科640802

思科认证

相关试题推荐
随机试题
最新回复(0)