Unit 3 Network

Here are the flashcards for the provided notes:

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### Network Security Methods

Flashcard 1: Authentication

Front: What are the advantages and disadvantages of authentication?

Back:

- Advantages: Easy setup, easily manageable by admin.

- Disadvantages: ID/password can be stolen; does not protect transmission.

Flashcard 2: Symmetric Encryption

Front: What are the advantages and disadvantages of symmetric encryption?

Back:

- Advantages: Secure with a single key; protects during transmission; suitable for large data.

- Disadvantages: No protection if the key is stolen.

Flashcard 3: Asymmetric Encryption

Front: What are the advantages and disadvantages of asymmetric encryption?

Back:

- Advantages: Highly secure with two keys; private key is never public.

- Disadvantages: Longer time to encrypt/decrypt; suitable for small data.

Flashcard 4: Trusted MAC Address

Front: What are the advantages and disadvantages of using trusted MAC addresses?

Back:

- Advantages: Manageable by admin; MAC is unique to the device.

- Disadvantages: Need to preregister devices.

Flashcard 5: Firewall (including antivirus)

Front: What are the advantages and disadvantages of firewalls?

Back:

- Advantages: Analyzes all traffic, including viruses; monitors traffic.

- Disadvantages: Often additional cost; performance might drop.

Flashcard 6: Physical Security

Front: What are the advantages and disadvantages of physical security?

Back:

- Advantages: Digital security can be bypassed by hackers.

- Disadvantages: High installation/maintenance cost; can be bypassed physically.

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### Wireless Networks

Flashcard 7: WiFi

Front: What are the characteristics of WiFi?

Back:

- Fast connection.

- Easy setup.

- Limited range.

- Used for local networks (LAN).

Flashcard 8: WiMAX

Front: What are the characteristics of WiMAX?

Back:

- Slower connection.

- Very wide range.

- Expensive to set up stations.

- Used for city-wide connections (MAN).

Flashcard 9: 3G/4G/5G Mobile

Front: What are the characteristics of 3G/4G/5G mobile networks?

Back:

- Fast (G stands for generation).

- Shorter range but can be covered by placing more transmitters.

Flashcard 10: Bluetooth

Front: What are the characteristics of Bluetooth?

Back:

- Very small range.

- Limited range provides security.

- Used for personal connections (PAN).

Flashcard 11: Infrared

Front: What are the characteristics of infrared networks?

Back:

- Requires visible distance.

- Cheap hardware.

- Old but still used in some applications.

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### Advantages and Disadvantages of Wireless Networks

Flashcard 12: Advantages of Wireless Networks

Front: What are the advantages of wireless networks?

Back:

- Low setup cost.

- Scalable without extra cabling.

- Not restricted by cable length.

- Convenient and easy to set up and use.

Flashcard 13: Disadvantages of Wireless Networks

Front: What are the disadvantages of wireless networks?

Back:

- Low security.

- Prone to interference.

- Limited range.

- Health concerns.

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### Importance of Standards in Network Construction

Flashcard 14: Standards

Front: Why are standards important in network construction?

Back: Standards enable compatibility through a common “language” internationally. Examples include TCP/IP, which is a communication standard involving TCP and IP protocols.

Flashcard 15: Guideline

Front: What is a guideline in networking?

Back: A set of recommended (not mandatory) advice for a situation. Example: The OSI model provides a guideline for how the structure of a connection will work.

Flashcard 16: Protocol

Front: What is a protocol in networking?

Back: A set of rules that must be followed by all parties involved in a system. Example: TCP defines how computers send and receive information.

Flashcard 17: Policy

Front: What is a policy in networking?

Back: An internal decision on how to follow standards/protocols. Example: A school IT team defines a policy that IP addresses are assigned by classroom number.

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### Types of Networks

Flashcard 18: LAN (Local Area Network)

Front: What is a LAN?

Back: A collection of devices connected together in one physical location (e.g., home, school, or office network).

Flashcard 19: VLAN (Virtual Local Area Network)

Front: What is a VLAN?

Back: A collection of devices logically grouped together, which may not be in the same physical LAN. It can also be a physical LAN partitioned into several VLANs based on switch logic.

Flashcard 20: WLAN (Wireless Local Area Network)

Front: What is a WLAN?

Back: A LAN connected through wireless transmission (e.g., WiFi).

Flashcard 21: PAN (Personal Area Network)

Front: What is a PAN?

Back: A network limited to devices around a user in a small physical distance (e.g., Bluetooth).

Flashcard 22: SAN (Storage Area Network)

Front: What is a SAN?

Back: A specialized network for high-speed transmission to storage devices.

Flashcard 23: WAN (Wide Area Network)

Front: What is a WAN?

Back: A network that connects different area networks, such as a city’s network or the internet.

Flashcard 24: Internet

Front: What is the internet?

Back: A WAN that connects the world.

Flashcard 25: Extranet

Front: What is an extranet?

Back: A network for organizations to have secure external connections to specific trusted users outside the organization.

Flashcard 26: Intranet

Front: What is an intranet?

Back: A network dedicated to internal use, often transferring confidential information or allowing access to internal databases.

Flashcard 27: P2P (Peer-to-Peer)

Front: What is a P2P network?

Back: A decentralized model where there are no central servers, and each computer interacts directly with another.

Flashcard 28: VPN (Virtual Private Network)

Front: What is a VPN?

Back: A mechanism for creating a secure connection between a device and a computer network, or between two networks, through an unsecured network like the internet.

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