TCP/IP Transport Layer: Protocols, Ports, and Security
TCP/IP Transport Layer
The Transport Layer, the third in the TCP/IP model, commonly uses TCP, but also UDP as an alternative.
UDP: Connectionless Communication
UDP provides simple, connectionless communication between applications. It is a direct, unreliable transmission method where messages can be lost or damaged. The unit of transmission is a UDP datagram. UDP is often used for real-time video and audio transmission, and not for DHCP.
TCP: Connection-Oriented and Reliable
TCP is connection-oriented,
Linux, UUE, Packet Switching, and AWK: A Practical Approach
Practice 1: Introduction to Linux
Linux Basic Commands
- pwd: Displays the current working directory.
- ls: Lists the contents of the current directory. If you pass the argument “-l”, it shows extended information.
- chmod: Changes the permissions of a file.
- Example:
chmod 777 file.cwould set the file permissions to rwxrwxrwx (owner, group, and others).
- Example:
- cd: Changes the directory.
- mkdir: Creates a directory.
- mv: Moves files.
- rm: Removes a directory.
- cat / more: Displays the contents of a file to standard output.
File Systems and Memory Management: Key Concepts
File Systems and Memory Management
Questions and Answers
1. Which is the following definition? It is the very element of information storage.
- a) Board.
- b) File.
- c) Subdirectory.
- d) None of the above.
2. Which of the following answers is not a valid classification in file systems?
- a) Network File System.
- b) General Purpose File System.
- c) Disk File System.
- d) System Configuration Files.
3. What is the correct file system for IBM’s OS/2?
- a) HFS.
- b) NFS.
- c) UFS.
- d) HPFS.
4. All operating systems are characterized by
Read MoreUnderstanding Windows User Account Types and Profiles
Understanding Windows User Account Types
The administrator account is designed for users who can make changes throughout the system, install software, and access all non-private files on your computer. Users with administrator accounts are the only ones with full access to other user accounts. A user with an administrator account:
- Can create and delete user accounts.
- Can change account names, images, passwords, and other account types.
- Cannot change their account type to limited unless there is at least
Information Systems, Hardware, Databases, and Networks: Key Concepts
Test 1: Information Systems
1. What is an Information System (IS)?
A set of interrelated components: input, process, output, and feedback.
An information system (IS) is a set of interrelated components that collect (input), manipulate and store (process), and disseminate (output) information, and provide a feedback mechanism to meet an objective.
True
2. Are Enterprise Resource Planning (ERP) systems dedicated to helping with decision-making?
False
3. How has the percentage of control evolved in the customer-
Read MoreArcView Task Manager: Key Features and Usage
1. Components of the ArcView Task Manager
The ArcView Task Manager comprises several essential components:
- View: Used for creating and opening maps.
- Table: Functions as a database, allowing the creation or opening of databases.
- Chart: Enables the creation of graphics.
- Layout: Provides a print preview.
- Script: Facilitates programming using Avenue.
2. File Types Supported by ArcView Project Manager
The ArcView Project Manager can open various file types, including:
- .SHP
- .SHX
- .DWF
- .APR
- .DBF