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Questions and Answers
What percentage of the overall grade does the final exam contribute?
What percentage of the overall grade does the final exam contribute?
Data communication refers only to the exchange of data over wireless connections.
Data communication refers only to the exchange of data over wireless connections.
False
Name one textbook used for the course.
Name one textbook used for the course.
Computer Networking: A Top-Down Approach (8th ed.)
The term telecommunication means communication at a ______.
The term telecommunication means communication at a ______.
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Match the following weeks with their respective topics:
Match the following weeks with their respective topics:
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Which of the following is NOT a component of the course content?
Which of the following is NOT a component of the course content?
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Which of the following can be considered a node in a network?
Which of the following can be considered a node in a network?
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Attendance for lectures and labs is optional.
Attendance for lectures and labs is optional.
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What does the acronym ARP stand for?
What does the acronym ARP stand for?
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A link in a network can only be a physical cable.
A link in a network can only be a physical cable.
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What are the three key criteria for evaluating a network?
What are the three key criteria for evaluating a network?
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A geometric representation of how computers are connected to each other is known as _____ .
A geometric representation of how computers are connected to each other is known as _____ .
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Which type of connection allows for multiple recipients of a single transmission?
Which type of connection allows for multiple recipients of a single transmission?
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Throughput is a measure of the reliability of a network.
Throughput is a measure of the reliability of a network.
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Match the following network terminologies with their definitions:
Match the following network terminologies with their definitions:
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Reliability in a network is measured in terms of availability and _____ .
Reliability in a network is measured in terms of availability and _____ .
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Which of the following is a disadvantage of ring topology?
Which of the following is a disadvantage of ring topology?
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A link failure in a ring topology can impact the entire network.
A link failure in a ring topology can impact the entire network.
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What are the three key elements of a protocol?
What are the three key elements of a protocol?
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The structure or format of the data in a protocol is known as _____ .
The structure or format of the data in a protocol is known as _____ .
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Match the types of networks with their characteristics:
Match the types of networks with their characteristics:
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What does 'semantics' refer to in the context of a protocol?
What does 'semantics' refer to in the context of a protocol?
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Ring topology allows data to travel in both directions between devices.
Ring topology allows data to travel in both directions between devices.
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What is one advantage of using ring topology?
What is one advantage of using ring topology?
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Which topology connects each device to every other device in the network?
Which topology connects each device to every other device in the network?
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In star topology, devices can communicate directly with each other.
In star topology, devices can communicate directly with each other.
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What is the main device called in star topology?
What is the main device called in star topology?
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In bus topology, all devices are connected to a main cable through __________.
In bus topology, all devices are connected to a main cable through __________.
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What is a disadvantage of mesh topology?
What is a disadvantage of mesh topology?
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Match the topology with its respective characteristic:
Match the topology with its respective characteristic:
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Bus topology allows for easy fault detection.
Bus topology allows for easy fault detection.
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What is a major drawback of star topology?
What is a major drawback of star topology?
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Which protocol is known for providing a reliable network service?
Which protocol is known for providing a reliable network service?
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Connectionless protocols guarantee the order of packet delivery.
Connectionless protocols guarantee the order of packet delivery.
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What is a key characteristic of a reliable connection?
What is a key characteristic of a reliable connection?
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The __________ protocol is an example of a connectionless service.
The __________ protocol is an example of a connectionless service.
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Which of the following statements is true regarding connectionless services?
Which of the following statements is true regarding connectionless services?
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Reliable connections use a three-way handshake for data transmission.
Reliable connections use a three-way handshake for data transmission.
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What kind of service is provided by connectionless protocols?
What kind of service is provided by connectionless protocols?
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Match the protocols with their characteristics:
Match the protocols with their characteristics:
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Which of the following protocols operate at the transport layer?
Which of the following protocols operate at the transport layer?
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In a client-server architecture, clients can communicate directly with each other.
In a client-server architecture, clients can communicate directly with each other.
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What is the primary purpose of the network layer in the Internet protocol stack?
What is the primary purpose of the network layer in the Internet protocol stack?
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The ______________ layer is responsible for the synchronization and recovery of data exchange.
The ______________ layer is responsible for the synchronization and recovery of data exchange.
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Match the following components with their descriptions:
Match the following components with their descriptions:
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Which architecture is characterized by peers directly communicating with each other?
Which architecture is characterized by peers directly communicating with each other?
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The physical layer is responsible for data transfer between neighboring network elements using bits on the wire.
The physical layer is responsible for data transfer between neighboring network elements using bits on the wire.
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What is an example of a protocol that operates at the link layer?
What is an example of a protocol that operates at the link layer?
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In a connection-oriented protocol, a connection must be established between the sender and the __________ before data can be delivered.
In a connection-oriented protocol, a connection must be established between the sender and the __________ before data can be delivered.
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Which layer of the OSI model would handle encryption and compression of data?
Which layer of the OSI model would handle encryption and compression of data?
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Study Notes
Course Information
- Course Title: CSS313 Advanced Computer Networks
- Week: 1
- Topic: Overview of Data Communication Model
- Semester: Fall 2024
- Instructor: Eman Sanad
- Textbooks:
- Computer Networking: A Top-Down Approach (8th ed.) by J.F. Kurose, K.W. Ross, Pearson, 2020
- DATA COMMUNICATIONS AND NETWORKING, Fourth Edition, Behrouz A. Forouzan 2007
Course Content
- Week 1: Overview of data communication model
- Week 2: Analysis of Network flow control and congestion control mechanisms
- Week 3: Internet Multicasting, NAT, VPN
- Week 4: Routing Algorithms – BGP, RIP, OSPF
- Week 5: MPLS
- Week 6: Data link layer and MAC address
- Week 7: ARP protocol
- Week 8: QoS: Differentiated and Integrated Services
- Week 9: Data Centre Networking
- Week 10: Network Function Virtualization -NFV Architecture, Use cases, NFV Orchestration and NFV for 5G
- Week 11: Cloud Computing infrastructure and services
- Week 12: IOT, Green Communication Networks
Course Evaluation
- Midterm: 30%
- Quizzes: 15% (3 quizzes, 5% each)
- Lab exam and project: 15%
- Final Exam: 40%
- Attendance: Mandatory for lectures and labs
Data Communication
- Telecommunication: Communication over a distance
- Data: Information presented in an agreed-upon form
- Data Communication: Exchange of data between devices via a transmission medium (e.g., wire cable).
Components of a Data Communication System
- Sender: The entity initiating the transmission
- Message: The data being transmitted
- Medium: The channel for transmission (e.g., cable, air)
- Receiver: The entity receiving the transmission
- Protocol: Rules governing data communication (e.g., syntax, semantics, timing).
Data Flow Types
- Simplex: Data flow in one direction only (e.g., mainframe to monitor)
- Half-duplex: Data flow in both directions, but only one direction at a time (e.g., two stations communicating)
- Full-duplex: Data flow in both directions simultaneously (e.g., two stations communicating simultaneously)
Networks
- Network: Set of devices (nodes) connected by communication links
- Node: A device in a network that can send or receive data
- Link: A connection between two nodes that can transfer data
-
Network Criteria: Performance, Reliability, Security
- Performance measured in terms of delay, throughput
- Reliability Measured as the availability and robustness of the network components
- Security protects against corruption or data loss from errors or malicious users
- Physical Structures: Type of Connection (Point-to-Point or Multipoint) and Topology (Mesh, Star, Bus, Ring)
Network Topologies
-
Mesh Topology: Each device connected to every other device with dedicated point-to-point links.
- Advantages: No data loss, reliable, secure, easy to troubleshoot, fast communication
- Disadvantages: Complex Wiring, costly to install, high no of I/O ports
-
Star Topology: All devices connect to a central device (hub).
- Advantages: Less expensive, Easier to install, Cost-effective, Robust, Easy troubleshooting, Reliable
- Disadvantages: Hub failure impacts entire network, Hub needs resources and maintenance, not scalable
-
Bus Topology: Single main cable with all devices connected via drop lines.
- Advantages: Easy installation, Less expensive, Limited failure
- Disadvantages: Difficult fault detection, not scalable, difficult to troubleshoot, data collision
-
Ring Topology: Devices connected in a closed loop.
- Advantages: Easy to install, less expensive, easy maintenance
- Disadvantages: Link failure impacts the whole network, Data traffic issues
Networks Categories
- Local Area Network (LAN): Designed for short distances and local interconnectivity
- Wide Area Network (WAN): Designed for long distances and connectivity over large areas
- Metropolitan Area Network (MAN): Designed for connectivity over areas like cities
Protocols
-
Protocol: Set of rules governing data communication (syntax, semantics, timing).
- Syntax: Structure/format of data
- Semantics: Meaning of the data
- Timing: When data should be sent and speed
Internet Protocol Stack
- Application Layer: Supporting network applications (FTP, SMTP, HTTP).
- Transport Layer: Process-to-process data transfer (TCP, UDP).
- Network Layer: Routing of data from source to destination (IP, routing protocols).
- Link Layer: Data transfer between neighbouring network elements (Ethernet, 802.11, PPP).
- Physical Layer: Transmission of bits (on the wire).
ISO/OSI Reference Model
- OSI model describes the networking framework. It has layers.
- Presentation Layer: Handles interpretation and conventions of data.
- Session Layer: Handles synchronization and recovery of sessions
- The internet stack lacks these layers (which must be implemented in the application if needed).
Application Architectures
-
Client-Server: A server provides service to clients
- Server: Always-on host, permanent IP, data centers for scaling
- Client: Communicates with server, may be intermittently connected, may have dynamic IPs
-
Peer-to-Peer (P2P): Arbitrary end systems communicate directly
- No always-on server, peers request service from other peers
- Self-scalable, new peers bring new service capacity and demands
TCP
- Connection-oriented protocol used to send data reliably over a network.
- Employs a handshake to establish a connection before transmitting the data.
- Guarantees the data packets reach in the same order and are not lost.
UDP
- Connectionless protocol used to send data quickly over a network.
- No need for connection establishment
- No guarantee is provided that the data packet will be reliably transmitted and delivered.
- Data loss and wrong sequencing/order are possible.
Reliable and Unreliable Connections
- Comparing TCP (reliable) and UDP (unreliable) transmission performance.
- reliable connection with guarantees at a cost of higher latency
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Description
Test your knowledge on key concepts related to the Data Communication course. This quiz covers important topics including network components, telecommunications terminology, and evaluation criteria for networks. Perfect for students preparing for their final exam or those looking to brush up on their skills.
