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| Concept/Formula | Definition/Equation | When to Use |
|---|---|---|
| Switch (Layer 2) | Connects devices within a LAN | Local network connectivity |
| Router (Layer 3) | Connects different LANs and the Internet | Inter-network communication |
| Firewall (L3/4/7) | Controls network traffic based on rules | Network security |
Type A: Identifying Device Function
Setup: "Given a network scenario, identify the appropriate device for a specific task."
Method: Consider the OSI layer at which the device operates and its primary function.
Example: A device needed to connect two different LANs. Answer: Router.
Type B: Firewall Placement
Setup: "Given a network diagram, determine the optimal placement of a firewall."
Method: Place the firewall at the network perimeter to control inbound and outbound traffic.
Example: Place the firewall between the internal network and the Internet.
Problem: Which device operates at Layer 2 of the OSI model and is primarily used for connectivity within a local area network (LAN)? Steps:
"✅Answer: Switch
| Concept/Formula | Definition/Equation | When to Use |
|---|---|---|
| 10BASE-T | 10 Mbps, Twisted Pair | Older Ethernet networks |
| 100BASE-T | 100 Mbps, Twisted Pair | Fast Ethernet networks |
| 1000BASE-T | 1 Gbps, Twisted Pair | Gigabit Ethernet networks |
| 10GBASE-T | 10 Gbps, Twisted Pair | High-speed Ethernet networks |
| UTP Cable | Unshielded Twisted Pair | Common Ethernet cabling |
| SFP Transceiver | Connects fiber to switches/routers | Fiber optic connections |
Type A: Cable Selection
Setup: "Given a network speed requirement and distance, select the appropriate cable type."
Method: Consider the Ethernet standard and maximum transmission distance for each cable type.
Example: Need 1 Gbps over 100 meters. Answer: 1000BASE-T.
Type B: Identifying Cable Type
Setup: "Given a description of a cable's physical characteristics, identify the cable type."
Method: Consider the number of wires, shielding, and connectors.
Example: Cable with 8 wires and RJ45 connectors. Answer: UTP.
Problem: Which Ethernet standard supports a speed of 100 Mbps over twisted pair cabling? Steps:
"✅Answer: 100BASE-T
| Concept/Formula | Definition/Equation | When to Use |
|---|---|---|
| OSI Model Layers | Application, Presentation, Session, Transport, Network, Data Link, Physical | Understanding network communication |
| TCP/IP Suite Layers | Application, Transport, Internet, Link | Practical network implementation |
| PDU | Protocol Data Unit | Data encapsulation at each layer |
Type A: Identifying OSI Layer Function
Setup: "Given a network function, identify the corresponding OSI layer."
Method: Consider the function of each OSI layer and match it to the given task.
Example: Encryption of data. Answer: Presentation Layer.
Type B: TCP/IP Layer Mapping
Setup: "Given an OSI layer, identify the corresponding TCP/IP layer."
Method: Understand the mapping between the two models.
Example: Network Layer. Answer: Internet Layer.
Problem: At which layer of the OSI model does encryption take place? Steps:
"✅Answer: Presentation Layer
| Concept/Formula | Definition/Equation | When to Use |
|---|---|---|
| Console Port | Physical connection to device | Initial configuration |
| User EXEC Mode | Limited access | Basic monitoring |
| Privileged EXEC Mode | Complete access | Viewing device configuration |
| Global Configuration Mode | Configuration changes | Modifying device settings |
Type A: Accessing CLI Modes
Setup: "Given a scenario, determine the commands to access a specific CLI mode."
Method: Use the 'enable' command to enter privileged EXEC mode and 'configure terminal' to enter global configuration mode.
Example: Entering global configuration mode. Answer: enable, then configure terminal.
Type B: Saving Configuration
Setup: "Given a modified configuration, determine the command to save it."
Method: Use the copy running-config startup-config command.
Example: Saving the current configuration. Answer: copy running-config startup-config.
Problem: Which command is used to save the running configuration to the startup configuration on a Cisco device? Steps:
"✅Answer:copy running-config startup-config
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