PAPER : Some Important Question & Answer CCNA (Part - 4)

1. A modem, CSU/DSU (Channel Service Unit/Data Service Unit), or TA/NT1 (Terminal Adapter/Network Termination 1) can be used to convert the user data from the DTE into a form acceptable to the WAN service’s facility. What is the juncture at which the CPE ends and the local loop portion of the service begins?
   * Demarc
   * CO
   * Local loop
   * Last-mile
   Correct answer: A
   
   
   

2. The demarcation or demarc is the juncture at which the CPE ends and the local loop portion of the service begins. The CO (Central Office) is the nearest point of presence for the provider’s WAN service. The local loop or “last-mile” is the cabling that extends from the demarc into the WAN service provider’s central office.
   
   You can access three forms of WAN services with Cisco routers. Select the three forms:
   * Switched or relayed services
   * Interface front end to IBM enterprise data center computers
   * Using protocols that connect peer-to-peer devices like HDLC or PPP encapsulation.
   * IPX/SPX
   * NetBEUI
   Correct answer: A, B & C
   
   
   

3. You can access three forms of WAN services with Cisco routers. Switched or relayed services include X.25, Frame Relay, and ISDN. An interface front end to IBM enterprise data center computers includes SDLC. And, you can access the services of WAN providers using protocols that connect peer devices such as HDLC and PPP encapsulation. IPX/SPX and NetBEUI are LAN protocols. Select the fields for the Cisco HDLC protocol:
   * Flag, Address, Control
   * Flag, Address, Control, Protocol, LCP (Code, Identifier, Length, Data), FCS, Flag
   * Flag, Address, Control, Data, FCS, Flag
   * Flag, Address, Control, Proprietary, Data, FCS, Flag
   Correct answer: D
   
   
   

4. The Cisco HDLC frame format is Flag, Address, Control Proprietary, Data, FCS, Flag. The PPP frame format is Flag, Address, Control, Protocol, LCP (Code, Identifier, Length, Data), FCS, Flag. The SDLC and LAPB format is Flag, Address, Control, Data, FCS, Flag. 85: Select the physical interfaces that PPP can be configured on a Cisco router:
   * Asynchronous serial
   * HSSI
   * ISDN
   * Synchronous serial
   Correct answer: A, B, C & D
   
   
   

5. All four of them can carry PPP traffic. HSSI is High Speed Serial Interface. Select the correct statements about PPP and SLIP for WAN communications?
   * PPP uses its Network Control Programs (NCPs) component to encapsulate multiple protocols.
   * PPP can only transport TCP/IP
   * SLIP can only transport TCP/IP.
   * SLIP uses its Network Control Programs (NCPs) component to encapsulate multiple protocols.
   Correct answer: A & C
   
   
   

6. 87a Which protocol for PPP LCP (Link Control Protocol) performs a challenge handshake?
   * CHAP
   * PAP
   * UDP
   * IPX
   Correct answer: A
   
   
   

7. 87b Which form of PPP error detection on Cisco routers monitors data dropped on a link?
   * Quality
   * Magic Number
   * Error Monitor
   * Droplink
   Correct answer: A
   
   
   

8. The Quality protocol monitors data dropped on a link. Magic Number avoids frame looping. Which protocol for PPP provides load balancing across multiple links?
   * Multilink Protocol (MP)
   * Quality
   * Magic Number
   * Stacker
   * Predictor
   Correct answer: A
   
   

9. As the system administrator, you type “ppp authentication chap pap secret”. Which authentication method is used first in setting up a session?
   * secret
   * PAP
   * CHAP
   * PPP/SLIP
   Correct answer: C
   
   

10. Select the compression protocols for PPP?
    * Stac
    * Predictor
    * Quality
    * Magic Number
    Correct answer: A & B
    
    

11. What are the three phases of PPP session establishment?
    * Link establishment phase
    * Authentication phase
    * Network layer protocol phase
    * Handshake phase
    * Dial-in phase
    Correct answer: A, B & C
    
    

12. What is the default IPX Ethernet encapsulation?
    * SNAP
    * Arpa
    * 802.2
    * Novell-Ether
    * SAP
    Correct answer: D
    
    

13. What must be true for two Routers running IGRP to communicate their routes?
    * Same autonomous system number
    * Connected using Ethernet only
    * Use composite metric
    D)Configured for PPP
    Correct answer: A
    
    

14. The following is partial output from a routing table, identify the 2 numbers in the square brackets; ‘192.168.10.0 [100/1300] via 10.1.0.1, 00:00:23, Ethernet1′
    * 100 = metric, 1300 = administrative distance
    * 100 = administrative distance, 1300 = hop count
    * 100 = administrative distance, 1300 = metric
    * 100 = hop count, 1300 = metric
    Correct answer: C
    
    

15. Identify 3 methods used to prevent routing loops?
    * Split horizon
    * Holddown timers
    * Poison reverse
    * SPF algorithm
    * LSP’s
    Correct answer: A B C
    
    

16. Which statement is true regarding full duplex?
    * Allows for transmission and receiving of data simultaneously
    * Only works in a multipoint configuration
    * Does not affect the bandwidth
    * Allows for transmission and receiving of data but not a the same time
    Correct answer: A
    
    
    

17. Full duplex is just the opposite of half duplex. It handles traffic in both directions simultaneously. Identify the switching method that receives the entire frame then dispatches it?
    * Cut-through
    * Receive and forward
    * Store and forward
    * Fast forward
    Correct answer: C
    
    Store and forward switching receives the entire frame before dispatching it.
    98Identify the purpose of ICMP?
    * Avoiding routing loops
    * Send error and control messages
    * Transporting routing updates
    * Collision detection
    Correct answer: B
    
    
    

18. ICMP is used to send error and control messages. Ping uses ICMP to carry the echo-request and echo-reply. 99Which statement is true regarding the user exec and privileged exec mode?
    * The ‘?’ only works in Privileged exec
    * They are identical
    * They both require the enable password
    * User exec is a subset of the privileged exec
    Correct answer: D
    
    
    

19. The user exec mode is a subset of the privileged exec mode. Only a certain number of commands are available at the user exec mode. Which OSI layer end to end communication, segmentation and re-assembly?
    * Network
    * Transport
    * Physical
    * Application
    * Data-Link
    * Presentation
    Correct answer: B
    
    
    

20. Layer 4 the Transport layer performs this function. What IP command would you use to test the entire IP stack?
    * Stack-test
    * Arp
    * Telnet
    * Ping
    * Trace
    Correct answer: C
    
    
    

21. Because Telnet is an application and it resides at the top of the stack it traverses down the stack and up the stack at the receiving end. Identify the 2 hardware components used to manage and/or configure a router?
    * Auxiliary port
    * ROM port
    * Management port
    * Console port
    Correct answer: A D
    
    
    

22. The 2 hardware ports used to configure the router are the console and auxiliary ports. What is the default bandwidth of a serial connection?
    * 1200 baud
    * 1.544 Mbps (T1)
    * 10 Mbps
    * 96Kpbs
    Correct answer: B
    
    
    

23. The default bandwidth is T1. Identify 2 functions of IPX access-lists?
    * Control SAP traffic
    * Limit number of Novell servers on a network
    * Limit number of workstations on a network
    * Block IPX traffic
    Correct answer: A D
    
    
    

24. IPX access lists are used to restrict IPX traffic and SAP broadcasts. Identify 2 HDLC characteristics?
    * Default serial encapsulation
    * Open standard
    * Supports Stacker compression
    * Supports point-to-point and multipoint
    Correct answer: A D
    
    
    

25. HDLC is the default serial encapsulation and supports point-to-point and multipoint. It is not an open standard and does not support compression. Identify 3 IP applications?
    * AURP
    * ARP
    * Telnet
    * SMTP
    * DNS
    * RARP
    Correct answer: C D E

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