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Top 70 CCNA Interview Questions

1) What is Routing? Routing is the process of finding a path on which data can pass from source to destination. Routing is done by a device called routers, which are network layer devices.

2) What is the purpose of the Data Link? The job of the Data Link layer is to check messages are sent to the right device. Another function of this layer is framing. 3) What is the key advantage of using switches? When a switch receives a signal, it creates a frame out of the bits that was extracted from that signal. With this process, it gains access and reads the destination address, after which it forwards that frame to the appropriate port. This is a very efficient means of data transmission, instead of broadcasting it on all ports. 4) When does network congestion occur? Network congestion occurs when too many users are trying to use the same bandwidth. This is especially true in big networks that do not resort to network segmentation. 5) What is a Window in networking terms? A Window refers to the number of segments that is allowed to be sent from source to destination before an acknowledgement is sent back. 6) Does a bridge divide a network into smaller segments? Not really. What a bridge actually does is to take the large network and filter it, without changing the size of the network. 7) Which LAN switching method is used in CISCO Catalyst 5000?

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This model uses the Store-and-forward switching method. It stores the entire frame to its buffers and performs a crc check before deciding whether or not to forward that data frame. 8 ) What is the role of the LLC sublayer? The LLC sublayer, short for Logical Link Control, can provide optional services to an application developer. One option is to provide flow control to the Network layer by using stop/start codes. The LLC can also provide error correction. 9) How does RIP differ from IGRP? RIP relies on the number of hops...