Summary of Introduction to Practical Computer Networking

Practical Computer Networking: A Student's Guide to LANs, Cables & Wi-Fi

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Introduction

Computer Networking Practice focuses on applying basic classification, cabling selection, and small-office/home-office (SOHO) topology skills through targeted exercises. These practice tasks help you recognize network types, choose appropriate media for given constraints, and design a simple home working network. Work through each exercise with pen and paper or a drawing tool to build practical intuition.

Definition: A practice exercise is a hands-on task designed to reinforce theoretical knowledge by applying it to realistic scenarios.

Exercise 1 — Classify: LAN, WAN, or WLAN

This exercise asks you to identify whether a scenario is a Local Area Network (LAN), Wide Area Network (WAN), or Wireless Local Area Network (WLAN). Remember: a WLAN is still a LAN; the "W" only indicates the connection is wireless.

Steps

  1. Read each scenario carefully and note the physical distance and whether connections are wired or wireless.
  2. Decide if all devices are within one site/building (LAN/WLAN) or span cities/countries (WAN).
  3. Write a one-sentence justification for each classification.

Examples and reasoning (expected answers)

  1. Two computers connected with a cable in the same room — LAN. Reason: devices are in the same local site using wired connection.
  2. You check your email on your phone using the café's Wi-Fi — WLAN. Reason: wireless access inside one local site.
  3. A bank's office in Stockholm connects to its server in Gothenburg — WAN. Reason: network spans cities.
  4. A warehouse uses wireless barcode scanners that talk to a server in the same building — WLAN. Reason: wireless inside a single building (WLAN is a LAN).
  5. You share a file between your laptop and desktop using your home router — LAN. Reason: devices in the same home network.
  6. A video call between offices in New York and Tokyo — WAN. Reason: international connection across wide area.
  7. A printer in the corner office receives a print job from a PC down the hall — LAN. Reason: devices within same local office via wired/wireless LAN.
  8. Your phone connects to the internet via mobile data (4G) — WAN. Reason: mobile cellular network provides wide-area connectivity.

Definition: A WLAN is a wireless implementation of a Local Area Network, confined to a limited area such as a room, building, or campus.

💡 Věděli jste?Fun fact: WLAN devices often use the 2.4 GHz and 5 GHz bands to balance range and bandwidth.

Exercise 2 — Choose the Right Cable

This exercise trains you to pick appropriate cabling based on distance, bandwidth requirement, and environment. Key constraints:

  • UTP (unscreened twisted pair) like Cat5e and Cat6 is economical and common for short runs (up to 100 m).
  • Multi-mode and single-mode fiber support longer distances and higher aggregate bandwidths.
  • For 10 Gbps or distances beyond UTP limits, fiber or higher-grade copper is required.

Cable options

  • UTP Cat5e — typical office use, supports up to 1 Gbps comfortably, some 10 Gbps only at short distances
  • UTP Cat6 — better performance and crosstalk control; supports 10 Gbps for limited lengths
  • Multi-mode fiber — optical fiber for moderate distances inside buildings/campuses
  • Single-mode fiber — optical fiber for long distances (kilometers)

Scenarios and reasoning (expected answers)

  1. Connect a PC to a wall outlet in a standard office (10 meters, regular internet use) — Cat5e or Cat6. Short run, standard speeds; Cat5e is sufficient, Cat6 gives extra headroom.
  2. Connect two switches in the same server room (5 meters, 10 Gbps required) — Cat6 or multi-mode fiber. 10 Gbps needs Cat6 (short runs) or multimode fiber for comfortable 10 Gbps links.
  3. Connect a building's network to a data center 8 km away — Single-mode fiber. Distance exceeds copper limits; single-mode fiber handles kilometers.
  4. Run cable under carpet between a switch and a printer (6 meters, light traffic) — Cat5e. Short, light-t
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Networking Practice Exercises

Klíčové pojmy: WLAN is a wireless LAN; WLAN means local scope, Classify by physical scope: same building = LAN/WLAN, different cities = WAN, UTP Cat5e is fine for short office runs (≤100 m) and light traffic, Choose Cat6 for 10 Gbps short runs or future-proofing, Multi-mode fiber for moderate building-to-building links; single-mode for kilometers, For 10 Gbps in a server room, use Cat6 or fiber, SOHO topology: ISP -> Router -> Switch -> wired devices; AP provides wireless, Label devices and connection types (solid = wired, dashed = wireless), Measure distance and bandwidth before picking cable, Document port mappings to aid troubleshooting, Under‑carpet short, light links can use Cat5e, Mobile/cellular connections are WAN services

## Introduction Computer Networking Practice focuses on applying basic classification, cabling selection, and small-office/home-office (SOHO) topology skills through targeted exercises. These practice tasks help you recognize network types, choose appropriate media for given constraints, and design a simple home working network. Work through each exercise with pen and paper or a drawing tool to build practical intuition. > **Definition:** A practice exercise is a hands-on task designed to reinforce theoretical knowledge by applying it to realistic scenarios. ## Exercise 1 — Classify: LAN, WAN, or WLAN This exercise asks you to identify whether a scenario is a Local Area Network (LAN), Wide Area Network (WAN), or Wireless Local Area Network (WLAN). Remember: a WLAN is still a LAN; the "W" only indicates the connection is wireless. ### Steps 1. Read each scenario carefully and note the physical distance and whether connections are wired or wireless. 2. Decide if all devices are within one site/building (LAN/WLAN) or span cities/countries (WAN). 3. Write a one-sentence justification for each classification. ### Examples and reasoning (expected answers) 1. Two computers connected with a cable in the same room — **LAN**. Reason: devices are in the same local site using wired connection. 2. You check your email on your phone using the café's Wi-Fi — **WLAN**. Reason: wireless access inside one local site. 3. A bank's office in Stockholm connects to its server in Gothenburg — **WAN**. Reason: network spans cities. 4. A warehouse uses wireless barcode scanners that talk to a server in the same building — **WLAN**. Reason: wireless inside a single building (WLAN is a LAN). 5. You share a file between your laptop and desktop using your home router — **LAN**. Reason: devices in the same home network. 6. A video call between offices in New York and Tokyo — **WAN**. Reason: international connection across wide area. 7. A printer in the corner office receives a print job from a PC down the hall — **LAN**. Reason: devices within same local office via wired/wireless LAN. 8. Your phone connects to the internet via mobile data (4G) — **WAN**. Reason: mobile cellular network provides wide-area connectivity. > **Definition:** A WLAN is a wireless implementation of a Local Area Network, confined to a limited area such as a room, building, or campus. Fun fact: WLAN devices often use the 2.4 GHz and 5 GHz bands to balance range and bandwidth. ## Exercise 2 — Choose the Right Cable This exercise trains you to pick appropriate cabling based on distance, bandwidth requirement, and environment. Key constraints: - UTP (unscreened twisted pair) like Cat5e and Cat6 is economical and common for short runs (up to 100 m). - Multi-mode and single-mode fiber support longer distances and higher aggregate bandwidths. - For 10 Gbps or distances beyond UTP limits, fiber or higher-grade copper is required. ### Cable options - **UTP Cat5e** — typical office use, supports up to 1 Gbps comfortably, some 10 Gbps only at short distances - **UTP Cat6** — better performance and crosstalk control; supports 10 Gbps for limited lengths - **Multi-mode fiber** — optical fiber for moderate distances inside buildings/campuses - **Single-mode fiber** — optical fiber for long distances (kilometers) ### Scenarios and reasoning (expected answers) 1. Connect a PC to a wall outlet in a standard office (10 meters, regular internet use) — **Cat5e or Cat6**. Short run, standard speeds; Cat5e is sufficient, Cat6 gives extra headroom. 2. Connect two switches in the same server room (5 meters, 10 Gbps required) — **Cat6 or multi-mode fiber**. 10 Gbps needs Cat6 (short runs) or multimode fiber for comfortable 10 Gbps links. 3. Connect a building's network to a data center 8 km away — **Single-mode fiber**. Distance exceeds copper limits; single-mode fiber handles kilometers. 4. Run cable under carpet between a switch and a printer (6 meters, light traffic) — **Cat5e**. Short, light-t