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IPX routing updates occur how often?
A.) Every 30 seconds
B.) Every 60 seconds
C.) Only as needed
D.) When the remote router asks for an update
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Which OSI layer supports the communication component of an application? A.) Data-Link B.) Physical C.) Session D.) Presentation E.) Application F.) Transport
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Which two of the following protocols are used at the Transport layer? A.) ARP B.) UDP C.) ICMP D.) RARP E.) TCP F.) BootP
What is refresher?
What is de-encapsulation?
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Which layer of the 7 layer model provides services to the Application layer over the Session layer connection? A.) Transport B.) Application C.) Session D.) Network E.) Datalink F.) Presentation
Your company has been assigned the IP address of 201.222.5.0 and require having 20 subnets. As the company’s network administrator, find the following: a) the subnet mask (2 marks) b) the number of useable subnets (2 marks) c) the subnetwork address for the 4th subnet (2 marks) d) the first usable IP address for the 4th subnet (2 marks) e) the last usable IP address for the 4th subnet (2 marks) f) the broadcast address for the 4th subnet. (2 marks)
what is the difference between osi and tcp ?
Which addresses are INCORRECTLY paired with their class? A. 128 to 191, Class B B. 192 to 223 Class B C. 128 to 191, Class C D. 192 to 223, Class C
what are the port numbers for DNS,FTP,TELNET,SMTP,NNTP
5 Answers Airtel, Walton Group,
On an ISDN BRI interface, the control channel is the 'D' channel. What is the rate of this channel? A.) 64 Kbps B.) 1.544 Mbps C.) 128 Kbps D.) 2.048 Mbps E.) 16 Kbps
CCNA 
