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Questions and Answers
What is the primary function of a router in a network?
What is the primary function of a router in a network?
- To convert data into electrical signals for transmission
- To connect multiple networks and direct data packets between them (correct)
- To connect devices within a LAN and facilitate their communication
- To serve as an interface between a computer and broadband modem
At which OSI layer do switches primarily operate?
At which OSI layer do switches primarily operate?
- Layer 4 (Transport Layer)
- Layer 1 (Physical Layer)
- Layer 2 (Data Link Layer) (correct)
- Layer 3 (Network Layer)
What role does a Network Interface Card (NIC) play in a device?
What role does a Network Interface Card (NIC) play in a device?
- It provides the interface for physical and logical connections to a network (correct)
- It encrypts data for secure transmission over a network
- It connects multiple networks and routes data packets between them
- It acts as a firewall to protect against unauthorized access
Which of the following is NOT a common use case for a VPN?
Which of the following is NOT a common use case for a VPN?
Which mechanism is NOT typically associated with fault tolerance in a network?
Which mechanism is NOT typically associated with fault tolerance in a network?
Which protocol is commonly used by routers to make forwarding decisions based on IP addresses?
Which protocol is commonly used by routers to make forwarding decisions based on IP addresses?
What kind of addressing does a switch primarily utilize for forwarding frames?
What kind of addressing does a switch primarily utilize for forwarding frames?
What is the key purpose of implementing redundancy in a network?
What is the key purpose of implementing redundancy in a network?
Flashcards
What is the purpose of a router?
What is the purpose of a router?
Connects multiple networks and directs data packets between them, enabling communication between devices on different networks (e.g., between your home network and the Internet).
At what OSI layer does a router operate?
At what OSI layer does a router operate?
Operates at Layer 3 (Network Layer) of the OSI model, using IP addresses to determine the best path for a packet to reach its destination.
What is the purpose of a switch?
What is the purpose of a switch?
Connects devices within a single network (e.g., a LAN) and facilitates communication between them.
At what OSI layer does a switch typically operate?
At what OSI layer does a switch typically operate?
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What is a Network Interface Card (NIC)?
What is a Network Interface Card (NIC)?
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What is the main function of a NIC?
What is the main function of a NIC?
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What is a VPN?
What is a VPN?
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What is Fault Tolerance?
What is Fault Tolerance?
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Study Notes
Routers and Switches: OSI Layers and Decisions
- Routers connect multiple networks, directing data packets between them; enabling communication across different networks like home to Internet.
- OSI Layer 3 (Network Layer); uses IP addresses to determine best paths for data packets. Consults routing tables and protocols (OSPF, BGP, RIP) to direct packets.
- Switches connect devices within the same network (e.g., LAN). Facilitates communication between devices within that network.
- OSI Layer 2 (Data Link Layer) mostly; Layer 3 switches also possible.
- Uses MAC addresses in network interface cards (NICs) to forward frames to correct destinations within the same network.
Network Interface Card (NIC)
- Hardware component enabling physical and logical network connections.
- Converts data between devices and signals (electrical, optical, or radio) for transmission over a network.
Virtual Private Networks (VPNs)
- Create secure, encrypted tunnels between devices and networks over the internet.
- Security: Encrypts data to prevent eavesdropping.
- Privacy: Hides user's IP address and location.
- Access: Allows remote access to private access and bypassing regional restrictions.
Fault Tolerance in Networks
- Ability for a system or network to continue operating even with component failures.
- Implementation: Redundancy (multiple devices/paths), Load Balancing (distributing traffic), and Failover Mechanisms (backup devices/paths).
RAID (Redundant Array of Independent Disks)
- Protects data by replicating it across multiple drives.
High Availability Protocols (e.g., HSRP, VRRP)
- Prevent single points of failure in networks by providing backup paths/devices.
Packet-Switched Networks
- Networks breaking data into small packets, routing independently to destinations.
- Key Steps: Data division into packets; routing packets based on source/destination IP addresses and network conditions; reassembly of packets at destination.
- Advantages: Efficient use of bandwidth, scalability, fault-tolerance.
- Example: Internet; using protocols like IP and TCP to handle addressing and delivery.
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Description
Explore the essential roles of routers and switches within the OSI model. Understand how Layer 2 and Layer 3 devices facilitate communication in both local and wide-area networks, including their functions in addressing and packet forwarding. This quiz also covers the importance of Network Interface Cards and Virtual Private Networks in data transmission.
