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 CCNA interview questions  CCNA Interview Questions
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Question
what is LAPB
 Question Submitted By :: Guest
I also faced this Question!!     Rank Answer Posted By  
 
  Re: what is LAPB
Answer
# 1
Link Access Procedure, Balanced (LAPB) is a data link 
layer protocol used to manage communication and packet 
framing between data terminal equipment (DTE) and the data 
circuit-terminating equipment (DCE) devices in the X.25 
protocol stack. LAPB, a bit-oriented protocol derived from 
HDLC,  LAPB makes sure that frames are error free and 
properly sequenced.
 LAPB cause trmoundes amount of overhead becoz of its 
strict timeout and windowing techniques.
 it is a connection-oriented protocol.
 
Is This Answer Correct ?    0 Yes 0 No
Mahesh
 

 
 
 
Other CCNA Interview Questions
 
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NetWare IPX addressing uses a network number and a node number. Which statements are true? A. The network address is administratively assigned and can be up to 16 hexadecimal digits long. B. The node address is always administratively assigned. C. The node address is usually the MAC address. D. If the MAC address is used as the node address, then IPX eliminates the use of ARP.  1
What is the protocol and what is the second part of the following network address? 172.16.0.254 mask - 255.255.0.0 A. IPX MAC address B. IP Class C directed broadcast C. Private IP address node number D. Public IP directed broadcast E. Private IP directed broadcast  1
What does the trace response !H mean? * A: Network unreachable * B: Not forwarded due to ACL restriction * C: Protocol unreachable * D: Port could not be reached  2
What is the purpose of the DLCI? A.) Identifies the remote routers B.) Contained with a 802.2 frame for routing purposes C.) Used with PPP during authentication D.) Identifies the PVC in a Frame Relay network  1
What is the default IPX Ethernet encapsulation? A.) SNAP B.) Arpa C.) 802.2 D.) Novell-Ether E.) SAP  1
Which routing protocols uses connection-oriented routing updates? A.) IGRP B.) UDP C.) RIP D.) IP E.) BGP  2
What are the 2 functions of the Data Link Mac layer? A.) Handles access to shared media B.) Manages protocol access to the physical network medium C.) Provides SAPs for higher level protocols D.) Allows multiple devices to uniquely identify one another on the data link layer  1
What are the two most common request/reply pair with ICMP messages when using the ping command? (Choose two) A. echo reply B. echo request C. source quench D. fragment onset E. information redirect F. destination reachable G. echo control message  1
Given the IPX address 4a.0002.1111.a999, what is the network ID and what is the node ID? A.) net 4a host 0002.1111.a999 B.) net a999 node 0002.1111 C.) net 0002.1111.a999 node 4a D.) net 0002.1111 node a999  1
How can you add the 192.168.100.0/30 network to EIGRP without involving the 192.168.100.4/30 network as well?  3
What does 'P' mean when running a Trace? A.) Good route B.) Protocol unreachable C.) Source Quench D.) Destination unreachable  2
A user device that connects to a DCE must be which of the following? A.) DTE B.) CPE C.) Demarc D.) DCE E.) CO  1
what is secure hand shake protocol  2
What are the difference between IPv4 & IPv6?? Can anyone explain more details about it..!! HCL4
When using access lists, it is important where those access lists are placed. Which statement best describes access list placement? A. Put standard access lists as near the destination as possible. Put extended access lists as close to the source as possible. B. Put extended access lists as near the destination as possible. Put standard access lists as close to the source as possible. C. It isn't import where access lists are placed since the router will read and cache the whole list. D. Put access lists as close to corporate headquarters as possible.  1
Which global configuration command will tell the router to load the IOS file 'IOS_filename' from FLASH memory at the next boot? A.) boot system flash B.) boot system flash IOS_filename C.) boot system IOS_filename flash D.) boot system tftp IOS_filename tftp_address E.) config-register 0x0102 IOS_ filename HSBC1
Which command will display the current time on a Cisco router? A.) show date B.) show clock C.) show running-configuration D.) show time E.) show controllers  2
Which protocol is used for booting diskless workstations? A.) IP B.) ARP C.) RARP D.) TCP E.) SNMP  2
As the system administrator, you type "ppp authentication chap pap secret". Which authentication method is used first in setting up a session? A. secret B. PAP C. CHAP D. PPP/SLIP  1
Which 2 commands shows the Cisco IOS filename? A.) show IOS B.) show ver C.) show flash D.) show mem E.) show NVRAM  1
 
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