Networking - Wide Area Networks

Exercise : Wide Area Networks - Wide Area Networks
  • Wide Area Networks - Wide Area Networks
11.
Which of the following describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols?
HDLC
Cable
VPN
IPSec
xDSL
Answer: Option
Explanation:
A allows the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols. A VPN can be set up across any type of link.

12.
Which of the following describes an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model?
HDLC
Cable
VPN
IPSec
xDSL
Answer: Option
Explanation:
IPSec is an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 Network layer of the OSI model.

13.
Which of the following uses ATM as the Data Link layer protocol that's terminated at what's known as the DSLAM?
DSL
PPPoE
Frame Relay
Dedicated T1
Wireless
Answer: Option
Explanation:
ATM is the Data-Link layer protocol that's typically used over the DSL layer 1 connection from the CPE and terminated at what's known as the DSLAM-an ATM switch that contains DSL interface cards, or ATU-Cs.

14.
When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?
Supplied by the CSU/DSU
By the far end router
By the clock rate command
By the Physical layer bit stream timing
Answer: Option
Explanation:
Clocking on a serial interface is always provided by the CSU/DSU (DCE device). However, if you do not have a CSU/DSU in your nonproduction test environment, then you need to supply clocking with the clock rate command on the serial interface of the router with the DCE cable attached.

15.
Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational?
frame-relay arp
frame-relay map
frame-relay interface-dci
frame-relay lmi-type
Answer: Option
Explanation:
If you have a router in your Frame Relay network that does not support IARP, you must create Frame Relay maps on your router, which provide known DLCI-to-IP address mappings.