🌐 Network Fundamentals & OSI Model - CCNA Practice Questions

Understand the OSI and TCP/IP models, network topologies, cabling types, and how data flows across enterprise networks. Core foundation for the CCNA 200-301 exam.

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1Exam Domains

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CCNA Network Fundamentals Question Bank (6 Questions)

Browse all 6 practice questions covering Network Fundamentals & OSI Model for the CCNA certification exam. Each question includes the full answer and a detailed explanation to help you understand the concepts.

  1. Question 1IP Connectivity

    What is the default OSPF network type on an Ethernet interface?

    APoint-to-point
    BBroadcast✓
    CNon-broadcast
    DPoint-to-multipoint
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Ethernet interfaces default to broadcast network type, which elects a DR and BDR. Serial interfaces default to point-to-point.

  2. Question 2Network Fundamentals

    Which type of fiber optic cable is typically used for long-distance connections?

    AMulti-mode fiber (MMF)
    BSingle-mode fiber (SMF)✓
    CCat6a
    DCoaxial
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Single-mode fiber uses a small core (8-10 microns) with a single light path, supporting distances up to 100 km+. Multi-mode (50-62.5 microns) is for shorter distances.

  3. Question 3Network Fundamentals

    Which of the following correctly describes a collision domain versus a broadcast domain?

    AA switch creates separate collision domains per port but a single broadcast domain; a router creates separate broadcast domains per interface✓
    BA hub creates separate collision domains per port; a switch creates separate broadcast domains per port
    CA router creates one collision domain for all interfaces; a switch creates separate broadcast domains per VLAN
    DBoth switches and routers break up collision domains and broadcast domains identically
    Show Answer & Explanation
    Correct Answer: A
    Explanation:

    A switch breaks collision domains at each port (each port is its own collision domain) but forwards broadcast frames to all ports in the same VLAN, creating a single broadcast domain per VLAN. A router does not forward broadcasts, so each router interface belongs to a separate broadcast domain.

  4. Question 4Network Fundamentals

    Which OSI layer is responsible for logical addressing and routing of packets between networks?

    AData Link layer (Layer 2)
    BNetwork layer (Layer 3)✓
    CTransport layer (Layer 4)
    DSession layer (Layer 5)
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    The Network layer (Layer 3) handles logical addressing (IP addresses) and determines the best path for routing packets across interconnected networks. Layer 2 handles MAC addressing and frame delivery on the local segment; Layer 4 manages end-to-end transport; Layer 5 manages sessions between applications.

  5. Question 5Network Fundamentals

    Which fiber optic connector type uses a push-pull latching mechanism and is commonly used in enterprise networking?

    ASC connector
    BLC connector✓
    CST connector
    DMTRJ connector
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    The LC (Lucent Connector) is a small form-factor connector using a push-pull latching mechanism, widely used in enterprise networking and SFP/SFP+ modules. SC uses a push-pull mechanism but is larger. ST uses a bayonet twist-lock mechanism. The LC's small size allows higher port density.

  6. Question 6Network Fundamentals

    What is the maximum distance for a Cat6a cable supporting 10 Gbps Ethernet?

    A55 meters
    B100 meters — Cat6a supports 10GBASE-T up to 100 meters, while Cat6 only supports 10G up to 55 meters✓
    C300 meters
    D25 meters
    Show Answer & Explanation
    Correct Answer: B
    Explanation:

    Cat6a: 10 Gbps up to 100m (full distance). Cat6: 10 Gbps limited to 55m (alien crosstalk issues). Cat5e: 1 Gbps up to 100m. Cat6a has stricter shielding requirements. All copper Ethernet standards are 100m for lower speeds (1G and below).

Key Network Fundamentals Concepts for CCNA

ositcp/iptopologyethernetnetworkcableutpfibercollision domainbroadcast domain

CCNA Network Fundamentals Exam Tips

Network Fundamentals & OSI Model questions in CCNA are typically scenario-based. Focus on service-level decision making aligned to official exam objectives. Priority concepts: osi, tcp/ip, topology, ethernet, network, cable.

What CCNA Expects

  • Anchor your answer in select the most practical, secure, and scalable answer for the stated scenario.
  • Network Fundamentals scenarios for CCNA are frequently mapped to Domain 1 (20%), so read the objective carefully before picking controls or architecture.
  • Expect multi-service scenarios where Network Fundamentals interacts with IAM, networking, storage, or observability patterns rather than appearing as an isolated service question.
  • When two options are both technically valid, prefer the choice that best aligns with the exam's operational scope (Associate) and managed-service best practices.

High-Value Network Fundamentals Concepts

  • Know the core Network Fundamentals building blocks cold: osi, tcp/ip, topology, ethernet.
  • Review the edge-case features and limits for network, cable; these details are commonly used to differentiate answer choices.
  • Practice service-integration reasoning: how Network Fundamentals pairs with Switching, IP Addressing, Routing in real deployment patterns.
  • For CCNA, explain why the chosen Network Fundamentals design meets reliability, security, and cost expectations better than the alternatives.

Common CCNA Traps

  • Watch for answers that partially solve the requirement but miss operational constraints.
  • Questions in Network Fundamentals often include distractors that look correct for Network Fundamentals but violate least-privilege, durability, or availability requirements.
  • Avoid picking options purely by feature name; validate data path, failure handling, and governance impact before answering.
  • If the prompt hints at automation or repeatability, eliminate manual-only operational answers first.

Fast Review Checklist

  • Can you compare at least two Network Fundamentals implementation paths and justify which one best fits the scenario?
  • Can you map the chosen answer back to Network Fundamentals (20%) outcomes for CCNA?
  • Can you explain security and access boundaries for Network Fundamentals without relying on default-open assumptions?
  • Can you describe how Network Fundamentals integrates with Switching and IP Addressing during failure, scaling, and monitoring events?

Exam Domains Covering Network Fundamentals

Domain 1Network Fundamentals20%

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