WAN Practice Exam Questions With 100% Correct Verified Answers.
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Course
WAN.
Institution
WAN.
WAN - correct answer A physical leases line WAN works a lot like an Ethernet crossover cable connecting 2 routers but with no distance limitations. Each router can send at any time full duplex. The speed is also symmetric meaning that both routers send bits at the same speed.
WAN Links - co...
WAN - correct answer A physical leases line WAN works a lot like an Ethernet crossover cable
connecting 2 routers but with no distance limitations. Each router can send at any time full duplex. The
speed is also symmetric meaning that both routers send bits at the same speed.
WAN Links - correct answer Leased line provide a physical layer bit transmission facility routers also
need to use a data link protocol on the WAN link to send bits over the link.
LAN interfaces - correct answer Routers receive frames in LAN interfaces and then the router
decapsulates the network layer packet. Before forwarding the packet the router encapsulates the
packet inside a WAN data link High level data link control HDLC.
Customer premise equipment CPE - correct answer This Telco term refers to the gear that sits at their
customers sites on the end of the link.
Channel service unit/data service unit. CSU/DSU - correct answer This device provides a function
called clocking in which it physically controls the speed and timing at which the router serial interface
sends and receives each bit over the serial cable.
Serial cable - correct answer This is a short cable that connects the CSU and the router serial
interface.
Routers - correct answer Many routers today use serial interfaces. These serial interfaces usually exist
as part of a removable card on the router called WAN interface cards WIC.
CSU - correct answer Tells the router when to send and receive bits. The router attempts to send and
receive bits only when the DCE creates the correct electrical impulses called clocking on the cable.
Cisco type field - correct answer The type field allows Cisco routers to support multiple types of
network layer packets to cross the HDLC link. An HDLC link between 2 Cisco routers can forward both
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