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CCENT, CCNA, CCNP, CCIE Interview Questions

By: M. Aslam

Q-1 which layer of the OSI model is responsible for reliable connections?

Answer: The Transport layer of the OSI model is responsible for reliable connections.

Q-2 what is the difference between acknowledgments and handshaking?

Answer: Handshaking is used to negotiate the properties of a connection that is being established. Acknowledgments are used to tell the sender that data has been successfully received by the destination during the use of a connection.

Q-3 How many VTP modes are there and what are they?

Answer: Three: Server, Client, and Transparent.

Q-4 what are the two types of Trunk encapsulation protocols?

Answer: IEEE 802.1Q and Cisco's ISL

Q-5 what are the four primary no routable protocols?

Answer: SNA, NetBIOS, DEC LAT, DEC MOP

Q- 6 What is the difference between TCP and UDP?

Answer: The primary difference between TCP and UDP is that TCP is a connection oriented
protocol and UDP is a connectionless protocol.

Q- 7 What is HSRP?

Answer: HSRP, or the Hot Standby Routing Protocol, is a Cisco proprietary protocol
that brings routing functionality to end devices that would otherwise not be
capable of taking advantage of redundant network connections. HSRP enables
a pair of Cisco routers to work together to present the appearance of a single
virtual default-gateway to end devices on a LAN segment.

Q- 8 What is the difference between a Public IP address and a Private IP address?

A: Public address space is a unique address that is assigned to a company.
Private address space is not recognized by the Internet and can be used by anyone
within their private network

Q- 9 What does AAA stand for?

Answer: Authentication, authorization, and accounting

Q- 10 The H.323 protocol is used for what?

Answer: H.323 is used for multiservice (multimedia) applications, usually in a Voice
Over IP environment.

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