Podcast
Questions and Answers
Which layer of the OSI model is primarily responsible for error-free data transfer between devices on the same network?
Which layer of the OSI model is primarily responsible for error-free data transfer between devices on the same network?
- Network layer
- Data link layer (correct)
- Transport layer
- Application layer
What is the main function of the Presentation layer in the OSI model?
What is the main function of the Presentation layer in the OSI model?
- Translates data into a format understood by applications (correct)
- Handles routing and forwarding of packets
- Ensures reliable data delivery across networks
- Maintains sessions between applications
Which of the following protocols guarantees data delivery in the Transport layer?
Which of the following protocols guarantees data delivery in the Transport layer?
- TCP (correct)
- HTTP
- IP
- UDP
In the TCP/IP model, which layer corresponds to the OSI’s Session layer?
In the TCP/IP model, which layer corresponds to the OSI’s Session layer?
Which of these examples best represents devices operating at the Network layer of the OSI model?
Which of these examples best represents devices operating at the Network layer of the OSI model?
Which combination of OSI layers does the Application Layer encompass?
Which combination of OSI layers does the Application Layer encompass?
What is the function of the FTP protocol on port 20?
What is the function of the FTP protocol on port 20?
At which OSI layer does a router primarily operate?
At which OSI layer does a router primarily operate?
Which port is used for secure web browsing?
Which port is used for secure web browsing?
What layer of the OSI model corresponds to network cards?
What layer of the OSI model corresponds to network cards?
Flashcards
Application Layer
Application Layer
The network layer that handles user interactions with applications like web browsing, file transfers, and email.
Protocol
Protocol
A set of rules that define how computers communicate over a network. Examples include HTTP for web browsing, FTP for file transfers, and SMTP for email.
Port Number
Port Number
A unique number associated with a specific service running on a computer. For example, port 80 is used for standard web browsing, and port 443 is used for secure web browsing.
Switch
Switch
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Router
Router
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Physical Layer (OSI Model)
Physical Layer (OSI Model)
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Data Link Layer (OSI Model)
Data Link Layer (OSI Model)
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Transport Layer (OSI Model)
Transport Layer (OSI Model)
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Session Layer (OSI Model)
Session Layer (OSI Model)
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Network Interface Layer (TCP/IP)
Network Interface Layer (TCP/IP)
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Study Notes
OSI and TCP/IP Models
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Physical Layer (Layer 1): Manages physical connections (cables, switches, and signal transmission – electrical, optical, or radio waves); examples include Ethernet cables and fiber optics.
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Data Link Layer (Layer 2): Enables error-free data transfer within the same network; handles MAC addresses and framing; examples include switches and network interface cards (NICs).
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Network Layer (Layer 3): Deals with routing, logical addressing (IP), and packet forwarding between networks; examples include routers and IP addresses.
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Transport Layer (Layer 4): Ensures reliable data delivery; uses TCP (guaranteed delivery) or UDP (faster but unreliable); examples include TCP and UDP.
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Session Layer (Layer 5): Manages communication sessions, including initiation, maintenance, and termination; examples include authentication protocols.
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Presentation Layer (Layer 6): Translates data into a format understandable by the application (e.g., encryption, compression); examples include SSL (Secure Sockets Layer) and TLS (Transport Layer Security).
TCP/IP Model
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Network Interface Layer: Combines OSI layers 1 and 2 (Physical and Data Link); handles MAC addressing, physical connections, and data framing.
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Internet Layer: Equivalent to OSI layer 3 (Network); handles IP addressing and packet routing.
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Transport Layer: Equivalent to OSI layer 4 (Transport); provides end-to-end communication using TCP/UDP protocols.
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Application Layer: Combines OSI layers 5, 6, and 7 (Session, Presentation, and Application); handles user-facing applications and protocols like HTTP, FTP, and DNS.
Common Ports and Protocols
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Port 80: HTTP (standard web browsing).
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Port 443: HTTPS (secure web browsing).
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Port 25: SMTP (sending emails).
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Ports 20/21: FTP (file transfer protocol).
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Port 53: DNS (domain name resolution).
OSI vs TCP/IP Layer Mapping
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Layer 2 (Data Link): MAC-based network interface (switch).
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Layer 3 (Network): IP-based network device (router).
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Layer 1, 2: Physical and Data link for network interface card(NIC).
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