IHK / FiSi Quizzes

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IPv4 fundamentals (subnetting)

Start with subnetting, host counts, and masks — diagrams, routing, and ACL come later.

• 01 – IPv4 subnetting L3

  4 equal subnets (exam style): /22–/28, RFC 1918.

• 01b – Subnets (3–7) L3

  Equal subnets (3–7): find the new prefix and network IDs yourself.

• 02 – Count hosts L2

  Usable hosts.

• 03 – Network range L3

  Network, first/last host.

• 04 – CIDR → mask L2

  Decimal subnet mask.

• 05 – Mask → prefix L2

  Find prefix length.

• 06 subnet count L2

  Split a network with a subnet mask — subnet count and hosts per subnet (IHK exam style).

• 06 – Which subnet? L3

  Network for host.

• 07 IP configuration L2

  Client table: find the faulty PC and error type (IHK exam style).

• 07 – VLSM (4 subnets) L3

  Exam-style VLSM: octet boxes + prefix per subnet (/28, mixed host needs).

• 08 public/private IP L2

  Home office: is the provider IPv4 public or private? (RFC 1918)

• 08 – Private addresses L2

  Public or private address.

• 09 valid host IP L2

  Network + mask: which IP can or cannot be used as a host? (IHK exam style)

• 09 – Binary octet L2

  8 bits → decimal.

• 10 /31 VPN pool L2

  Address pool (RFC 3021): how many /31 point-to-point links are possible? (IHK exam style)

• 10 – Summarization L3

  Summarize four /24s.

• 11 NAT/PAT field L2

  NAT overload: which header field changes besides source IP?

• 12 – Wildcard mask L3

  Inverted mask.

• 16 NAT vs PAT L2

  Definition: NAT translates addresses, PAT also maps ports (overload).

• 17 NAT header path L3

  Client → router → ISP: source IP, port, TTL, protocol after PAT.

• 18 PAT source port L2

  Why does PAT change the source port? (Many clients, one public IP)

• 19 DNAT / port forward L2

  203.0.113.x:22 → 10.10.10.x:22 — where does the router forward?

• 20 carrier-grade NAT L2

  Mobile 10.x — CGNAT: reason and disadvantage (no inbound access).

• 21 OSI device → layer L2

  Switch, router, hub, bridge, AP, L3 switch, firewall, proxy — which OSI layer?

• 22 Wireshark client IP + VLAN L2

  802.1Q trace: read client source IP and VLAN ID from Wireshark excerpt.

• 24 firewall rules (80/443) L2

  Permit HTTP/HTTPS only, deny the rest — pick rule set or evaluate traffic.

• 25 stateful firewall (SPI) L2

  Stateful packet inspection: TCP state, seq/ack, return traffic without session.

• 26 bandwidth (video conference) L2

  Sum video and audio streams → required Mbit/s (formula in walkthrough).

• 27 bandwidth (data transfer) L2

  MiB/Mbit/s or Byte/kbit/s → transfer time (formula in walkthrough).

• 28 bandwidth (webcam) L2

  Resolution, color depth, FPS → required Mbit/s (formula in walkthrough).

• 29 UPS / electrical L2

  Power, battery capacity (Ah×V) → runtime in minutes.

• 30 SAN storage L2

  Utilization, expansion, growth → free capacity in GiB per year.

• 31 power costs L2

  Power draw, kWh price, 24/7 → monthly power cost in EUR.

• 32 record storage L2

  Record count × KiB → storage needed in GiB (GiB vs. GB explained).

• 33 NAS / RAID L3

  20 TiB net, 4 TiB drives — calculate disk count for RAID 1, 5 and 6.

• 34 SLA / availability L2

  365 × 24 h, downtime share from SLA — max. outage hours per year (one decimal).

• 35 cloud backup / transfer time L3

  GiB → bytes → bits, 10% protocol overhead, Mbit/s — duration in minutes and seconds.

• 36 hotline cost (AP1) L3

  On-call + call minutes → uniform EUR/min rate (formula in walkthrough).

• 37 utility analysis (AP1 2024) L3

  Add weighted points — find winning vendor (1–4) and highest total.

• 38 monthly CAD cost (AP1 2024) L3

  Amortization, lease, maintenance — total monthly EUR cost for all CAD seats.

• 39 PLY RGB (AP1 2024) L2

  Color count (2^n) and extra storage % vs. coordinate data.

• 40 Make-or-Buy (AP1 2022) L2

  In-house vs. external licenses — from how many licenses is build cheaper?

• 41 PSU efficiency (AP1 2021 H) L2

  Useful power ÷ efficiency → grid draw or monthly cost.

• 42 PSU payback (AP1 2021 H) L2

  Price premium ÷ monthly savings → payback months (round up).

• 43 power strip (AP1 2021 H) L2

  230 V × rated amps vs. total device power — can all run at once?

• 44 PowerShell disk warning (AP1 2021 H) L2

  Get-Volume script: fix comparison operator or percent formula.

• 45 mailbox migration cost (AP1 2021 H) L2

  Hourly rate × time per mailbox × count → total cost.

• 46 mailbox migration duration (AP1 2021 H) L2

  Total hours ÷ (workers × daily hours) → earliest completion in days.

• 47 RAID recommendation (AP1 2021 H) L2

  Availability + disk failure + capacity: pick RAID 0, 1 or 5.

• 48 CIA protection goal (AP1 2021 H) L2

  Security measure → confidentiality, integrity or availability.

• 50 – Network plan (AP1 2021 H) L2

  Task table, GP/FP for H, critical path, delay on task H (+4 h).

• 51 – Scanner storage (AP1 2022 H) L3

  dpi → MiB/scan, scans/day, daily TiB (cardboard QC).

• 52 – RAID 5 mixed drives (AP1 2022 H) L2

  Different TB sizes — maximum net TB (one parity drive).

• 55 – Purchase vs. lease L2

  Purchase total vs. monthly rate × term — difference in EUR.

• 56 – Installment loan (AP1 2024 H) L3

  Equal annual payments — annuity, total interest, total paid.

• 57 – Project net/gross (AP1 2024 H) L2

  Lock system — hardware + N-year license, then VAT.

• 68 – Decision matrix (AP1 2025 Spring) L3

  Rank 1–3 per criterion — winning device and total score.

• 69 – MFP monthly cost (AP1 2025 Spring) L3

  Purchase amortization + print — EUR/month (rounded).

• 70 – Website network plan L3

  GP/FP task C, critical path, project end 157 h.

• 74 – AI chatbot cost (AP1 2025 Spring) L3

  Annual: subscription + training + lost billable hours.

• G01 – Broadcast address L2

  Broadcast address for the network.

• G02 – Network address L2

  Network address for the host.

• G03 – First host L2

  First usable host address.

• G04 – Last host L2

  Last usable host address.

• G05 – Number of subnets L2

  How many equal subnets?

• G06 – Prefix for host count L3

  Shortest prefix for n usable hosts.

• G07 – Block size L2

  Total addresses in the subnet block.

• G08 – Wildcard (random mask) L2

  Wildcard mask for the subnet mask.

• G10 – Total addresses L2

  2^(32−prefix) — all addresses in block.

• G11 – Host in subnet? L2

  Is the host inside the network?

• G12 – Usable hosts L2

  Usable host count for CIDR.

• G13 – Host range L3

  First and last usable host for a host IP or network.

• G14 – Max subnets & hosts L3

  Maximum subnets and usable hosts per subnet from a network.

• G15 – Mask for subnets & hosts L3

  Find prefix for X subnets with Y hosts each (e.g. 710 subnets, 50 hosts).

• G16 – Next network L2

  Next subnet network address.

• G17 – Host bits L2

  How many host bits in the prefix?

• G18 – DHCP pool L2

  Assignable DHCP addresses after reserved hosts.

• G19 – Invalid host L2

  Which address cannot be assigned to a host?

• G20 – Address class L2

  Public, private, loopback, link-local, multicast.

• G21 – Broadcast after subnet L3

  Broadcast in a subnetted /24 (e.g. /26).

• G22 – Pick subnet mask L2

  Choose prefix for required host count.

• G23 – P2P / WAN link L1

  Usable hosts on /29–/32 WAN or point-to-point links.

• G24 – Subnets from topology L2

  How many subnets are needed for this topology? (diagram)

• G26 – Hex netmask → 255.x L2

  Convert ifconfig hex netmask (e.g. 0xfffffc00) to decimal 255.x.x.x.

Diagram tasks (AP1)

Structure charts, ERM and similar schema tasks — not network topology.

• Diagram 53 – Structure chart launchTask (AP1 2022 H) L3

  Rolling mill API loop with emergency stop — fill missing lines.

• Diagram 54 – ERM rolling mill (AP1 2022 H) L2

  Chen notation: primary key and cardinality.

• Diagram 58 – checkAuthority (AP1 2024 H) L2

  Pseudocode + keyData table — True/False for id and room.

• Diagram 71 – analytics_berechnen (AP1 2025 Spring) L3

  Desk check: three return values, two decimals.

Diagram subnetting

Visual drills (original topologies) — exam-style practice, not copied from third-party sites.

• Diagram D01 – Valid interface IP L3

  Three LANs: two configured — valid /28 IP for Gi0/3 without overlap (A–D).

• Diagram D02 – /30 peer address L2

  Find the missing router IP on a /30 link.

• Diagram D03 – More host bits (A/B) L2

  Two VLANs on diagram: which has more host bits?

• Diagram D04 – Router on a stick L3

  Pick the subinterface config for new VLANs (A–D).

• Diagram D05 – Hidden subnet L3

  Find the hidden P2P network in the VLSM diagram.

• Diagram D06 – Mask in VLAN design L2

  What subnet mask is used for both VLANs shown?

• Diagram D07 – Route → interface L3

  Route table + diagram: which interface reaches the destination?

• Diagram D08 – Hosts in block (diagram) L2

  How many usable hosts in the highlighted subnet?

• Diagram D09 – IP configuration error L3

  Topology + client table: wrong gateway/mask/duplicate IP/net ID — which error? (A–D)

• Diagram G25 – Default gateway (ifconfig) L3

  ifconfig output: network ID + first usable host as default gateway.

Route summarization & wildcard

Multiple subnets behind a router — wildcard mask or summary CIDR (ACL / OSPF).

• RS RS01 – Wildcard (multiple subnets) L3

  Wildcard mask covering several subnets behind a router.

ACL — Access lists (grouped wildcard)

Standard and extended ACLs: permit/deny, network + wildcard for subnets behind a router.

• ACL ACL01 – Wildcard (grouped) L3

  Wildcard covering all subnets behind router A.

Routing Questions

Static routes and next-hop — CCNA-style topology drills.

• RT R01 – Static route L3

  Configure a static route from the diagram (A–D).

• RT R02 – Branch static route (R1/R2) L3

  Main office — /30 — new office: static route on R1 (A–D).

• RT R03 – Route table (LPM) L3

  show ip route: destination IP — longest prefix match, which interface? (A–D)

• RT R04 – Route selection (LPM / protocols) L3

  show ip route: EIGRP/RIP/OSPF/IS-IS — which route for destination? (A–D)

• RT R05 – Routing table L3

  show ip route: destination route for packet? (A–D)

• RT R06 – Connected routes (LPM) L3

  show ip route: which interface for destination IP? (A–D)

• RT R07 – Route mask (LPM) L3

  show ip route: subnet mask of the destination route (CCNA style).

• RT R08 – Route metric (LPM) L3

  show ip route: metric of chosen route (not AD) — A–D.

• RT R09 – Static route next hop (LPM) L3

  show ip route static + topology: shared next hop for two destinations.

• RT R10 – Next hop (routing table LPM) L3

  Prefix/interface/next-hop table: LPM → next hop for destination IP.

• RT R11 – Default route next hop L3

  show ip route: no match → gateway of last resort → next hop.

• RT R12 – Packet handling (LPM) L3

  show ip route: overlapping R/S/D/O — how is the packet handled?

• RT R13 – Static route (shared LAN R1/R2/R3) L3

  Shared /24 segment: static route on R1 to reach R3 LAN (A–D).

• RT R14 – Static route (/30 P2P R14/R86) L3

  R14 → R86: static route to 172.21.34.0/25 network (A–D).

• RT R15 – Default route (Vlan56/57) L3

  show ip route: 10.56.192.1 — no LPM match → next hop (A–D).

• RT R16 – Static route (WAN failover R1/R2) L3

  Dual WAN circuits: floating static default (AD 2) when primary fails (A–D).

• RT R17 – Route table (remove static / load balancer) L3

  show ip route: after removing static/default routes — which server stays reachable? (A–D)

• RT R18 – Route entry subnet mask L3

  show ip route | begin Gateway: subnet mask for route {net} (CCNA style).

• RT R19 – Next hop (static/OSPF LPM) L3

  show ip route: S 172.16.3.0/24 vs O 172.16.3.0/28 — LPM → next hop + interface (A–D).

• RT R20 – Dual default routes (AD) L3

  R1/R2/R3: two ip route 0.0.0.0 — PC1 to PC3 packets routed how? (A–D)

• RT R21 – Route table host (AD/metric/…) L3

  show ip route: host IP — AD, metric, prefix, next hop, interface, or route code (A–D).

• RT R22 – Route table packet (mask/prefix/…) L3

  show ip route: packet source/dest — mask, prefix, code, interface, default … (A–D).

• RT R23 – Routing table entry (LPM) L3

  Entry # / network / subnet mask table: longest prefix match for host IP (A–D).

• RT R24 – Route table protocol (LPM → interface) L3

  Overlapping R/O/D routes: LPM → interface, code, AD, metric, or prefix (A–D).

• RT R25 – Next-hop (least desirable metric) L3

  Four routers on shared segment: R1 routing table — next-hop with least desirable metric (A–D).

• RT R26 – Route table protocol → prefix L3

  show ip route: which network prefix was learned via RIP, OSPF, EIGRP, or static? (A–D, varied).

• RT R27 – AD → protocol (route) L3

  show ip route: for route {prefix}, identify protocol from default AD (RIP/OSPF/EIGRP/BGP, varied).

• RT R28 – Border static (LPM → next hop) L3

  Static ip route config on border router: LPM for destination IP → next hop (A–D).

• RT R29 – Missing route (branch → HQ) L3

  show ip route on branch router: missing HQ network route — which ip route command? (A–D)

• RT R30 – Swapped gateways (find 2 errors) L3

  Branch sites Hamburg/Munich: default gateways swapped — which two errors? (A–D, pick two)

• RT R31 RIP basics L2

  Distance vector, hop limit, update interval — which statement about RIPv2 is correct?

• RT R31 – Swapped next-hops (routing table) L3

  R-Zentral show ip route: Hamburg/Munich static routes — find two wrong next-hops (A–D, pick two)

• RT R32 dynamic vs. static L2

  Advantages of dynamic routing: auto adaptation, failover — theory MCQ.

• RT R32 – IBB routing table (WAN/DMZ/LAN) L3

  Topology: router with WAN, DMZ and LAN — complete network ID and subnet mask in the routing table.

• RT R33 routing metric L2

  Lowest metric = best route (same protocol) — theory MCQ.

• RT R33 – IBB broadcast (WAN/DMZ/LAN) L3

  Topology: determine the broadcast address for each of the three networks at the router.

• RT R34 RIP path selection L2

  Fewest hops wins — bandwidth is not considered — theory MCQ.

IPv6 Quizzes

• 01 – Subnetting (4 subnets) L3

  Split into 4 equal subnets.

• 02 – Subnet count L2

  How many /64 networks?

• 03 – Network ID? L2

  Is the IPv6 address the network ID? (yes/no)

• 04 – Notation L2

  Short or full notation.

• 05 – Address types L2

  Pick link-local.

• 06 – EUI-64 L3

  MAC → link-local.

• 07 – SLAAC/DHCPv6 L2

  Read RA flags.

• 08 – ICMPv6/NDP L2

  Message type (NS).

• 09 – Dual stack L2

  Dual-stack scenario.

• 10 – Aggregation L3

  Summarize three /64s.

• 11 – Best practice L1

  Typical LAN prefix.

• 12 – Wireshark L2

  Source or destination IPv6 from trace.

• 13 Wireshark IPv6 sender/receiver L2

  IPv6 trace: read source and destination from header (A–D).

• 13 – Same subnet? L2

  Two IPv6 addresses — same subnet? (yes/no), practice style.

• 14 – IPv6 interface (ISP/LAN) L3

  Diagram: ISP / R1 / switch — manual /127 + eui-64 /64 (choose two).

• 15 – IPv6 eui-64 (R1 Gig0/0) L3

  R1/R2 + IPv6 block: dynamic Gi0/0 assignment via eui-64 /64 (A–D).

• 16 – IPv6 floating default route L3

  show ipv6 route: ND ::/0 [2/0] — floating static default to {nh} (A–D).

WiSo — trade calculations

Procurement and sales calculation per IHK schema (forward calculation).

• WiSo W1 – Procurement price (Bezugspreis) L2

  List price, discount, cash discount, procurement costs → Bezugspreis (calculation schema).

• WiSo W2 – List selling price L3

  Forward calc: procurement + handling + profit + customer discount (im Hundert).

• WiSo W3 – List purchase price (backward calc) L4

  Backward calculation: list selling price and terms → list purchase price (calculation schema).

• WiSo W4 – Surcharge rates L3

  Cost price, cash selling price and HK/profit/total markup rates (calculation schema).

• WiSo W5 – Free calculation L3

  Enter your own values → calculate the full forward calculation schema.

SQL — database queries

Interactive SQL trainer. Tables on the left, queries on the right.

• SQL SQL Trainer — 32 tasks

  SELECT, INSERT, UPDATE, DELETE: WHERE, JOIN, aggregates, LIKE, IN, BETWEEN, NULL and more.