单项选择题
A. 802.1q tag B. Port C. Application D. IP address
Which of the following is an invalid IPv4 address?（）A.2...
单项选择题Which of the following is an invalid IPv4 address?（）
A.225.0.0.1 B.254.254.0.0 C.256.0.0.4 D.224.2.1.4
An administrator needs to update a router configuration...
单项选择题An administrator needs to update a router configuration for a router that does not support SSH.Which of the following can be used to securely update the router configuration?（）
A.FTP B.SNMPv2 C.TFTP D.KTTPS
New service from the telephone company is delivered ove...
单项选择题New service from the telephone company is delivered over fiber, but the technician does not have a fiber module for the router. Which of the following would remedy this issue?（）
A. OTDR B. Media converter C. CSU/DSU D. Fiber repeater
