wide area networks interview question

11.

Which of the following describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols?
A.     HDLC    B.     Cable
C.     VPN    D.     IPSec
E.     xDSL
Answer & Explanation

Answer: Option C

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.
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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?
A.     HDLC    B.     Cable
C.     VPN    D.     IPSec
E.     xDSL
Answer & Explanation

Answer: Option D

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.
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13.

Which of the following uses ATM as the Data Link layer protocol that’s terminated at what’s known as the DSLAM?
A.     DSL
B.     PPPoE
C.     Frame Relay
D.     Dedicated T1
E.     Wireless
Answer & Explanation

Answer: Option A

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.
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14.

When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?
A.     Supplied by the CSU/DSU
B.     By the far end router
C.     By the clock rate command
D.     By the Physical layer bit stream timing
Answer & Explanation

Answer: Option A

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.
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15.

Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational?
A.     frame-relay arp
B.     frame-relay map
C.     frame-relay interface-dci
D.     frame-relay lmi-type
Answer & Explanation

Answer: Option B

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.

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