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CCNA Networking - 50 Essential Topics

Master CCNA networking with 50 flashcards covering IP addressing, routing, switching, security, and automation.

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Front

IPv4 Multicast Range

Back

224.0.0.0 to 239.255.255.255 (Class D) Used for one-to-many communication (e.g., routing protocol updates).

Front

OSI Model: Layer 1

Back

Physical Layer Transmits raw bit streams over physical medium (cables, hubs, repeaters).

Front

OSI Model: Layer 2

Back

Data Link Layer Handles MAC addressing and framing (switches, bridges). show mac address-table

Front

OSI Model: Layer 3

Back

Network Layer Responsible for logical addressing and routing (IP addresses, routers). show ip route

Front

OSI Model: Layer 4

Back

Transport Layer Manages end-to-end communication and error recovery (TCP, UDP).

Front

TCP vs. UDP

Back

Connection-oriented vs. Connectionless TCP ensures delivery (HTTP/FTP); UDP is faster but unreliable (VoIP/DNS).

Front

Star Topology

Back

Centralized Hub/Switch Connection All nodes connect to a central device; easy to troubleshoot but central failure kills network.

Front

Single-mode vs. Multi-mode Fiber

Back

Long distance vs. Short distance Single-mode uses lasers for miles; Multi-mode uses LEDs for buildings/campuses.

Front

Straight-through vs. Crossover Cable

Back

Different vs. Same device types Straight-through: Switch to Router; Crossover: Switch to Switch (obsolete via Auto-MDIX).

Front

Collision Domain vs. Broadcast Domain

Back

Hub port vs. Router port Each switch port is a collision domain; each router port is a broadcast domain.

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