单项选择题
A. a serial cable with a V.35 to RJ45 adapter
B. a CSU/DSU
C. an external ISDN TA and NT1
D. The non-modular router cannot connect to an ISDN service. The network administrator must purchase a modular router with an ISDN BRI-U card.
多项选择题 What are two results of entering the Switch(config)# vtp mode client command on a Catalyst switch?（）
单项选择题 A group of hosts are physically connected to the same switch. The hosts are used by employees of different departments and therefore do not need to directly exchange data on a regular basis.Which technology can a network administrator deploy to reduce unnecessary broadcast traffic between these hosts?（）
单项选择题 A network administrator needs to configure a serial link between the main office and a remote location. The router at the remote office is a non-Cisco router.How should the network administrator configure the serial interface of the main office router to make the connection?（）