Introduction to Computer Networks

What is meant by data communication? Impquestions: What are the three criteria necessary for an effective and efficient network? Impquestions: What are the three fundamental characteristics determine the effectiveness of the data communication system? Impquestions: What are the advantages of distributed processing? Impquestions: Why are protocols needed? ImpquestionsWhy are standards needed? For n devices in a network, what is the number of cable links required for a mesh and ring topology? Impquestions: What is the difference between a passive and an active hub? Impquestions: Distinguish between peer-to-peer relationship and a primary-secondary relationship. Impquestions: Assume 6 devices are arranged in a mesh topology. How many cables are needed? How many ports are needed for each device? Impquestions: Group the OSI layers by function. Impquestions: What are header and trailers and how do they get added and removed? Impquestions: The transport layer creates a communication between the source and destination. What are the three events involved in a connection?

Physical Layer

Impquestions: What is the DC component? Impquestions: How does NRZ-L differ from NRZ-I? Impquestions: What are the functions of a DTE? What are the functions of a DCE? Impquestions: What does the electrical specification of EIA-232 describe? Impquestions: Discuss the mode for propagating light along optical channels. Impquestions: What is refraction? Impquestions: How are the guided media differing from unguided transmission media? Impquestions: What are the disadvantages of optical fiber as a transmission medium? Impquestions: What are the criteria used to evaluate transmission medium? Impquestions: Give the relationship between propagation speed and propagation time? Impquestions: Explain cross talk and what is needed to reduce it?

Data Link layer

Impquestions: What are the responsibilities of data link layer? Impquestions: Mention the types of errors. Impquestions: Define the terms: Single bit error, Burst Error Impquestions: What is redundancy? Impquestions: List out the available detection methods. Impquestions: Write short notes on VRC. Impquestions: Write short notes on LRC. Impquestions: Write short notes on CRC. Impquestions: Write short notes on CRC generator. Impquestions: Write short notes on CRC checker. Impquestions: Give the essential properties for polynomial. Impquestions: Define checksum. Impquestions: What are the steps followed in checksum generator? Impquestions: List out the steps followed is checksum checker side. Impquestions: Write short notes on error correction. Impquestions: Mention the types of error correcting methods. Impquestions: What is the purpose of hamming code? Impquestions: Define flow control. Impquestions: What is a buffer? Impquestions: Mention the categories of flow control. Impquestions: What is the function of stop and wait flow control? Impquestions: Mention the advantage and disadvantage of stop and wait flow control. Impquestions: Define ARQ. Impquestions: Mention the function of go-back N-ARQ. Impquestions: What is selective reject ARQ? Impquestions: Define HDLC. Impquestions: List the types of stations is HDLC. Impquestions: Define configuration. Impquestions: List the various ways of station configuration. Impquestions: Mention the types of frames in HDLC. Impquestions: Give the usage of I, S, U frames. Impquestions: Write the types of frame fields contained in HDLC. Impquestions: What is meant by bit stuffing? Impquestions: Define LAN. Impquestions: Mention the various architecture in a LAN. Impquestions: Define a standard 802.3 Impquestions: List the most command kinds of Base band 802.3 LAN. Impquestions: Mention the different kinds of Ethernet networks. Impquestions: Write short notes on FDDI. Impquestions: Describe the three HDLC station types? Impquestions: What is piggy backing? Impquestions: Name the four types of S-frames? Impquestions: Name the five categories of U-frames?

Network Layer

Impquestions: What are the network support layers and the user support layers? Impquestions: Explain the relationship of IEEE Project to the OSI model? Impquestions: What are the functions of LLC? Impquestions: What are the functions of MAC? Impquestions: What is protocol data unit? Impquestions: What are headers and trailers and how do they get added and removed? Impquestions: What are the responsibilities of network layer? Impquestions: What is a virtual circuit? Impquestions: What are data grams? Impquestions: What are the two types of implementation formats in virtual circuits? Impquestions: What is meant by switched virtual circuit? Impquestions: What is meant by Permanent virtual circuit? Impquestions: Define Routers. Impquestions: What is meant by hop count? Impquestions: How can the routing be classified? Impquestions: What is time-to-live or packet lifetime? Impquestions: What is meant by brouter? Impquestions: Write the keys for understanding the distance vector routing. Impquestions: Write the keys for understanding the link state routing. Impquestions: How the packet cost referred in distance vector and link state routing? Impquestions: How the routers get the information about neighbor? Impquestions: What are the four internetworking devices? Impquestions: Define IP address. Impquestions: What is Token Bus? Impquestions: What is token passing? Impquestions: Define Masking? Impquestions: What are the rules of boundary-level masking? Impquestions: What are the rules of nonboundary-level masking? Impquestions: Define Gateway. Impquestions: What is LSP?

Transport Layer

Impquestions: What is function of transport layer? Impquestions: What are the duties of the transport layer? Impquestions: What is the difference between network layer delivery and the transport layer delivery? Impquestions: What are the four aspects related to the reliable delivery of data? Impquestions: What is meant by segment? Impquestions: What is meant by segmentation? Impquestions: What is meant by Concatenation? Impquestions: What are the types of multiplexing? Impquestions: What are the two possible transport services? Impquestions: The transport layer creates the connection between source and destination. What are the three events involved in the connection? Impquestions: What is meant by congestion? Impquestions: Why the congestion occurs in network? Impquestions: What is meant by quality of service? Impquestions: What are the two categories of QoS attributes? Impquestions: List out the user related attributes? Impquestions: What are the networks related attributes? Impquestions: What is the difference between service point address, logical address and physical address?

Application Layer

Impquestions: What is the purpose of Domain Name System? Impquestions: Discuss the three main division of the domain name space. Impquestions: Discuss the TCP connections needed in FTP. Impquestions: Discuss the basic model of FTP. Impquestions: What is the function of SMTP? Impquestions: What is the difference between a user agent (UA) and a mail transfer agent (MTA)? Impquestions: How does MIME enhance SMTP? Impquestions: Why is an application such as POP needed for electronic messaging? Impquestions: Write down the three types of WWW documents. Impquestions: What is the purpose of HTML? Impquestions: Define CGI. Impquestions: Name four factors needed for a secure network. Impquestions: How is a secret key different from public key? Impquestions: What is a digital signature? Impquestions: What are the advantages & disadvantages of public key encryption? Impquestions: What are the advantages & disadvantages of secret key encryption? Impquestions: Define permutation. Impquestions: Define substitutional & transpositional encryption.