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Questions and Answers
Is an IP address sufficient for identifying a process on a host?
Is an IP address sufficient for identifying a process on a host?
- No, processes share IP addresses but use different ports.
- Yes, each IP address corresponds to a unique process.
- No, many processes can be running on the same host. (correct)
- Yes, each process listens to its own IP address.
What role does the transport layer play in data communication?
What role does the transport layer play in data communication?
- It ensures logical communication between application processes on different hosts. (correct)
- It encapsulates application data into network layers without processing.
- It sends application messages without segmentation.
- It provides physical communication between devices.
How does the sending side of the transport protocol handle application messages?
How does the sending side of the transport protocol handle application messages?
- It encrypts messages for security.
- It breaks messages into segments and passes them to the network layer. (correct)
- It combines all messages into a single segment.
- It directly sends messages without any processing.
What does the network layer do with transport segments?
What does the network layer do with transport segments?
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What is the responsibility of the data link layer?
What is the responsibility of the data link layer?
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Study Notes
Course Overview
- Course Name: Mobile Communications & Wireless Technology (IT 709)
- Duration: 4 years, 7th semester
- Instructor: Tawffeeg Mohammed Tawfeeg
Course Units
- Unit 1: Introduction
- Unit 2: Wireless Transmission Media
- Unit 3: Wireless Links and Network Characteristics
- Elements of a wireless network
- Unit 4: WiFi Wireless LANs
- 802.11 MAC Protocol
- Collision-avoidance techniques
- Addressing issues with hidden terminals
- Technologies: WiMax and Bluetooth
- Unit 5: Mobility Management
- Mobility within the same subnet
- Mobile routing and management
- Unit 6: Cellular Internet Access
- Generations: 2G, 3G, 4G, and 5G
- Unit 7: Mobile IP and Handoff in GSM
Textbook
- Title: Computer Networking: A Top Down Approach
- Authors: Jim Kurose, Keith Ross
- Edition: Fifth edition, Addison-Wesley, July 2010
Course Evaluation
- Labs + Assignments: 25 Marks
- Midterm Exam + Quizzes + Seminars: 15 Marks
- Final Exam: 60 Marks
OSI & TCP/IP Models
- Application Layer: Interface between user and network
- Application protocols facilitate process-to-process communications over IP.
Network Applications
- Examples: E-mail, Internet telephone, Web browsing, Real-time video, Instant messaging, Remote login, P2P file sharing, Multi-user gaming, Streaming video.
Application Architectures
- Types: Client-server, Peer-to-peer (P2P), and Hybrid models.
Network Application Development
- Programs operate across different end systems and communicate via a network.
- Applications communicate using sockets, which serve as endpoints for message exchanges.
Process Communication
- Definitions:
- Client process: Initiates communication.
- Server process: Waits for incoming requests.
- P2P architectures enable inter-host communication through message exchanges.
Sockets
- Sockets function as doorways for message transmission between processes.
- Sending process uses TCP buffers for message delivery.
Process Addressing
- Each process requires a unique identifier, combining an IP address and port number.
- Example Port Numbers:
- HTTP: 80
- Mail: 25
Transport Layer Functions
- Provides logical communication between application processes on different hosts.
- Encompasses various transport protocols, such as TCP and UDP.
Network Layer Functions
- Responsible for segment delivery from sending to receiving hosts.
- Encapsulates segments into datagrams for network transmission.
- Routers examine header fields of IP datagrams for proper routing.
Link Layer Responsibilities
- Transfers datagrams to physically adjacent nodes across wired, wireless, or LAN connections.
- Manages layer-2 packets (frames) for effective datagram transfer between nodes.
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