Network Fundamentals

CCNA · 60 questions

• A city clerk needs a device that forwards packets between the permits VLAN and the Internet edge so online applications can reach public systems. Which device best fills that role?
• A county courts IT team upgrades a closet so one chassis can switch traffic inside staff VLANs and also route between those VLANs for courts users. Which device role matches that requirement?
• A public health clinic wants an appliance that inspects traffic and can block malicious flows aimed at public-health portals, not merely forward packets by destination IP. Which component best matches that need?
• A building permits desk installs radios so field inspectors can join staff Wi-Fi without running new copper to every temporary desk. Which network component provides that 802.11 radio edge?
• A fire district wants IP phones and cameras in the station to draw power from the closet switch instead of separate wall adapters. Which capability should the access switch provide?
• A police records bureau designs a compact campus where access switches uplink only to a distribution layer that also acts as the core, with no separate core tier. Which topology architecture is that?
• A sanitation department keeps separate access, distribution, and core layers across city hall and annex buildings for a larger hierarchical campus. Which architecture does that describe?
• A wastewater plant builds a data-hall fabric where every leaf switch uplinks to spines so server-to-server east-west traffic scales predictably. Which topology is that?
• A stormwater bureau connects remote pump stations to headquarters over provider circuits spanning the county. Which topology characteristic best describes that design?
• A tax assessor compares keeping file servers in the civic data room versus hosting the citizen portal in a cloud region. What distinction should the team apply?
• An election office needs single-mode fiber between distant fire stations and multimode fiber for shorter runs inside HQ, while desks still use copper. When is single-mode the better choice?
• A 911 PSAP must modernize uplinks away from older shared coaxial-era media toward today's Ethernet closet design. Which connection model should they standardize on for switch-to-switch links?
• A municipal hospital campus stocks RJ-45 copper for desk drops and fiber SFPs for closet-to-closet links that exceed 100 meters or face strong EMI. What drives that interface choice?
• A community college district standardizes LC fiber patching for distribution uplinks while keeping copper access drops to classrooms. Which design role split does that reflect?
• An airport authority sees CRC errors and late collisions on a desk port after a duplex mismatch with a legacy printer. What do those symptoms most strongly indicate?
• A port authority traces flapping uplinks and rising input errors to a damaged fiber patch between closets. Which conclusion best fits those indicators?
• A housing authority finds one switch port locked at 100/full while the attached legacy device is at 100/half after hard-coding speed and duplex on only one end. What is the likely result?
• A parks and recreation team correlates excessive collisions with a shared hub still installed in a temporary election staging room. What does that symptom most likely indicate?
• A fleet garage needs reliable, ordered, acknowledged delivery for permit-PDF uploads from tablets to the records server. Which transport behavior should they choose?
• An emergency-management office streams live council-meeting video where low latency matters more than retransmitting every lost packet. Which transport is the better fit?
• A library consortium compares SSH management sessions that use a three-way handshake with lightweight DNS queries on the same municipal network. What contrast is most accurate?
• A transit authority must collect syslog from hundreds of closets without maintaining a transport session per device. Which approach best fits that operational messaging pattern?
• A water utility must carve a 192.168.10.0/24 into four equal subnets for permits, finance, operations, and guest kiosks. Which prefix length creates those equal networks?
• A school district assigns 10.50.20.0/27 to a pump-station LAN. What is the usable host range and broadcast address for that subnet?
• A city hall campus needs to know how many usable host addresses a /29 yields for a tiny CCTV switch segment. How many usable hosts does that prefix provide?
• Animal control compares 10.20.30.45/28 and 10.20.30.50/28 on the shelter VLAN plan. What is true about these two addresses?
• Code enforcement plans VLSM so sparse rural clinics get small subnets while HQ needs many more hosts. What is the main reason to right-size each subnet this way?
• A public works yard documents the mask 255.255.255.192 for a new CCTV segment. Which prefix length matches that dotted-decimal mask?
• County jail IT places the parks VLAN gateway as the first usable address in 10.40.12.0/28. Which address should be configured on the SVI?
• A museum campus host is set to 192.168.40.90/24 while the VLAN SVI gateway is 192.168.41.1/24. What is the most likely connectivity root cause?
• A city clerk assigns RFC1918 addresses to internal desks and keeps public IPs only on the Internet edge. What is the primary purpose of using private IPv4 space internally?
• County courts needs an internal-only address plan for a SCADA island that must not use public Internet space. Which block is appropriate private IPv4 addressing?
• A public health clinic uses only private IPv4 on clinic PCs. Why can those addresses alone not reach citizen Internet destinations?
• A building permits desk dual-stacks a new clinic LAN and must put a valid IPv6 global unicast prefix on the SVI. Which action meets that requirement?
• A fire district shortens 2001:0db8:0000:0000:0000:0000:0000:0001 for city documentation. Which compressed form is correct?
• Police records verifies a dual-stack staff SVI should use a /64. Which check confirms the interface has the intended IPv6 prefix length?
• Sanitation receives a 2001:db8:abcd::/48 county allocation and must give each building a /64. How many /64s does that /48 provide?
• A wastewater plant checks that a newly enabled dual-stack kiosk learned usable IPv6 parameters. Which set of host checks best confirms basic IPv6 readiness?
• Stormwater printers only need on-link discovery on their VLAN and will not be Internet-reachable. Which IPv6 unicast type is always present for local link operations even without a global address?
• A tax assessor places the same IPv6 service address on responders at redundant clinics so clients reach the nearest instance. Which address type is being used?
• An election office sees FF02::1 traffic used during Neighbor Discovery on a staff VLAN. What role does this IPv6 address type play?
• A 911 PSAP derives a static host’s IPv6 interface identifier from MAC 00:1A:2B:3C:4D:5E using modified EUI-64. Which statement correctly describes that formation?
• A municipal hospital documents addressing for an air-gapped lab that must never be Internet-routed. Which IPv6 unicast type fits that internal-only design?
• A community college district images a Windows clerk PC and must confirm IPv4 address, mask, gateway, and DNS before handoff. Which approach best verifies those client parameters?
• An airport authority’s macOS field-inspector laptop cannot reach intranet apps over Wi-Fi. What should be verified first among client IP parameters?
• A port authority Linux kiosk must prove IPv4/IPv6 and default-route settings before opening day. Which action best verifies those Linux client parameters?
• A housing authority packs 2.4 GHz access points around hearing rooms and must reduce co-channel interference. Which channel plan best follows nonoverlapping 2.4 GHz practice?
• Parks and recreation publishes one staff WLAN and a separate guest WLAN at city hall. What does the SSID represent in that design?
• Fleet garage tablets show weak Wi-Fi through thick courthouse walls. Which RF fundamental best explains the coverage problem?
• Emergency management requires that permit tablets not send traffic in the clear on municipal Wi-Fi. What wireless principle addresses that need?
• A library consortium is packing extra access points into a gymnasium voting center and must balance channel width against interference. What planning choice best matches that wireless trade-off?
• A transit authority consolidates several physical servers into virtual machines on one hypervisor in the civic data room. What fundamental benefit does that server virtualization provide?
• A water utility packages a lightweight permit-API worker as a container rather than a full virtual machine. At CCNA fundamentals depth, how do containers differ from VMs?
• A school district isolates SCADA routing from corporate routing on the same PE-style edge device. Which virtualization concept provides separate routing and forwarding tables for that separation?
• City hall runs all election applications as virtual machines on a single hypervisor host. What risk awareness should the campus team emphasize about that design?
• Animal control watches a closet switch learn a clerk PC’s MAC address and later age the entry out after the laptop sleeps. What switching behavior does that illustrate?
• Code enforcement expects a known unicast frame to leave only the switch port where the destination MAC was learned. What forwarding behavior is that?
• A public works yard sees an unknown unicast frame flooded out every port in the VLAN except the one where it entered. What switching concept explains that?
• County jail IT inspects the switch MAC address table to locate which closet port a rogue camera is using. What does that table primarily provide?
• A museum campus predicts that a broadcast ARP request will reach every host in the same VLAN. What switching concept supports that prediction?