Wide Area Network (WAN) is a computer network that covers a broad areA. Which statement is correct for wide-area network (WAN)?（）

单项选择题Which WLAN device is often used to make wireless connections between buildings or campuses?（）

A.access point
B.client adapter
C.bridge
D.router

单项选择题Which software-based security threat is typically spread from user to user via e-mail?（）

A.Data interception
B.Virus
C.Trojan horse
D.Denial of service

单项选择题What does a router do?（）

A.Routes traffic down alternative paths and connects the local-area network (LAN) to the wide- area network (WAN)
B.Reads Media Access Control (MAC) addresses to forward messages to the correct location and connects the local-area network (LAN) to the wide-area network (WAN)
C.Stores data on the network and connects the local-area network (LAN) to the wide-area network (WAN)
D.Broadcasts data to all devices that are connected to it across the local-area network (LAN) and wide-area network (WAN)

单项选择题The cisco telepresence portfolio provides industry-leading video-conferencing solutions , how does the Cisco acquisition of tandberg strengthen its position（）

A.it enablescisco to eliminate product redundancies and improve margins
B.it will givecisco products A strategic advantage by providing privileged access to the TIP
C.it providescisco with its first high-end telepresence offering
D.it allowscisco to quickly broaden its product portfolio to better serve customer needs

单项选择题Why is the Cisco Integrated Services Router product line A good choice for customers?（）

A.it is A point product solution that addresses A single need
B.it simplifies purchasing because there is only one model to choose.
C.it integrates multiple services into A single platform and reduces operating costs.
D.it provides customers with an opportunity to increase the number of devices in their network