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Q:

What protocol would you use if you were running xDSL and needed authentication?

Answer

PPPoE  or  PPPoA

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Subject: CCNA

Q:

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
 
Answer & Explanation Answer: C) VPN

Explanation:

A VPN allows or describes 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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Filed Under: CCNA

Q:

Which of the following is an industry-wide standards suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer3 Network layer of the OSI model?

A) HDLC B) xDSL
C) VPN D) IPSec
 
Answer & Explanation Answer: D) IPSec

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 layer3 Network layer of the OSI model.

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Q:

How should a router that is being used in a Frame Relay  network be configured to keep split horizon issues from preventing routing updates

A) Configure a seperate subinterface for each PVC with a unique DLCI and subnet assigned to the subinterface B) Combine multiple Frame Relay circuits as a point-to-point line to support multicast and broadcast traffic
C) Configure many subinterfaces in the same subnet D) Configure a single subinterface to establish multiple PVC connections to multiple remote router interfaces.
 
Answer & Explanation Answer: A) Configure a seperate subinterface for each PVC with a unique DLCI and subnet assigned to the subinterface

Explanation:

If you have a serial port configured with multiple DLCIs connected to multiple remote sites, split horizon rules stop route updates received on an interface from being sent out the same interface. By creating subinterfaces for each PVC, you can avoid the split horizon issues when using Frame Relay.

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Q:

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
 
Answer & Explanation Answer: A) DSL

Explanation:

ATM is the Data-Link layer protocol that's typically used over the DSL layer1 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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Q:

The Acme Corporation is implementing dail-up services to enable remote-office employees to connect to the local network. The company uses multiple routed protocols,needs authentication of users connecting to the network, and since some calls will be long distance, needs callback support. Which of the following protocols is the best choice for these remote services? 

A) 802.1 B) Frame Relay
C) HDLC D) PPP
 
Answer & Explanation Answer: D) PPP

Explanation:

PPP is your only option because HDLC and Frame RElay do not support these types of business requirements. PPP provides dynamic addressing , authentication using PAP or CHAP, and callback services.

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Q:

You need to configure a router for a Frame Relay connection to a non-Cisco router. Which of the following commands will prepare the WAN interface of the router for this connection?

A) Router (config-if) #encapsulation frame-relay q933a B) Router (config - if) #encapsulation frame-relay ansi
C) Router (config - if) #encapsulation frame-relay ietf D) Router (config - if) #encapsulation frame-relay cisco
 
Answer & Explanation Answer: C) Router (config - if) #encapsulation frame-relay ietf

Explanation:

If you have a Cisco router on one side of a Frame Relay network and a non-Cisco router on the otherside, you would need to use the Frame Relay encapsulation type of IETF. The default is Cisco encapsulation, which means that a Cisco router must be on both sides of the Frame Relay PVC.

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Q:

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 bits stream timing
 
Answer & Explanation Answer: A) Supplied by the CSU/DSU

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 non-production 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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Filed Under: CCNA