Network_ARP Protocol

Network_ARP Protocol

ARP Protocol 1. ARP (Address Resolution Protocol) is a protocol used to obtain the MAC address   needed for communication within the same network segment using an IP address. 2. The ARP protocol consists of 28 bytes.  Hardware Type (2 bytes): The type of protocol used at Layer 2.Protocol Type (2 bytes): The address of IPv4.Hardware Address Length (1 byte): The length of the MAC address.Protocol ..

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  • · 2024. 9. 28.
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Network_IP

Network_IP

Functions of Layer 31. Although computers use MAC addresses to communicate with each other,    for the convenience of people, they use IP addresses to send and receive data. 2. It serves the role of connecting LANs (Local Area Networks). 3. The device used to connect LANs is a router (OSI Layer 3).  IP Address1. IPv4 address: The IP address currently assigned to the PC. 2. Subnet mask: Defines t..

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  • · 2024. 9. 28.
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Network_OSI Layer 2

Network_OSI Layer 2

Layer 2 - It is responsible for managing data flow and error control  between communication devices within the same LAN network. - When communicating with networks in different LAN segments,  Layer 3 is required.  MAC address(6bytes) used in Layer 2- It is a physical address with a unique value (in hexadecimal). - The first 6 digits represent the OUI (Organizationally Unique Identifier),   which..

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  • · 2024. 9. 9.
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Network_Packet Structure

Network_Packet Structure

How am I connected to Google? Method: Enter tracert 8.8.8.8 in the command prompt.- tracert is a command used to trace the route to a DNS IP address.- 8.8.8.8 is the IP address of Google's DNS server.- The result of the above command represents the network hops between  Google and my computer through which data is transmitted. - A total of 10 network hops were traversed for the data to be delive..

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  • · 2024. 9. 3.
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Network_Overview of network devices

Network_Overview of network devices

Network Interface Card (NIC):A Network Interface Card (NIC) is a device that allows a computer to connect to a network.NICs have a unique Media Access Control (MAC) address physically embedded in them,which is used to identify each device within the network.  Hubs:Hubs are older central connecting devices that act as multi-port repeaters.They operate at the Physical Layer (Layer 1) of the OSI mo..

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  • · 2024. 8. 27.
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SQL_Read, Update, Delete

★ When deleting or updating data, it is important to first verify the data using the 'SELECT' statement! ★  Accessing all columns in a table-> SELECT * FROM cats; Retrieving only the 'name' column data-> SELECT name FROM cats; Retrieving multiple specific columns-> SELECT name, age FROM cats; Using 'WHERE' to specify conditions-> SELECT * FROM cats WHERE age = 4; -> SELECT * FROM cats WHERE name..

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  • · 2024. 8. 23.
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