Free IP Addressing and SOHO Networks practice questions
10 free 220-1201 questions on IP Addressing and SOHO Networks, each with a full explanation — no account needed. This section sits in the Networking part of the exam. Answer every question to see your score, then read the lessons below for anything you missed.
A technician is troubleshooting a desktop PC in a small office that cannot access the internet or internal file servers. The PC shows an IP address of 169.254.34.12. Other devices on the same switch are functioning normally. Which action best addresses the root cause of this issue?
An address in the 169.254.x.x range indicates Automatic Private IP Addressing, which occurs when a device cannot reach a DHCP server. Since other devices are working, the most likely cause is a connectivity issue preventing DHCP communication. Verifying cabling, switch ports, or DHCP availability directly addresses the underlying problem rather than masking it with manual configuration.
A technician notices that two workstations on the same LAN can communicate with each other but cannot reach a third workstation that is addressed within the same IPv4 range. All three have unique IP addresses. Which misconfiguration is the most likely cause?
The subnet mask tells a host which addresses are on its own network; if the third workstation carries the wrong mask, it decides its neighbours are remote and tries to send through a gateway instead of talking to them directly, so local communication fails even though its address is valid. Private addresses are wrong because RFC 1918 addressing works perfectly on a LAN and is what almost every office uses. Missing NAT is wrong because NAT only matters for traffic leaving the private network, not for two hosts on the same switch. A missing default gateway is wrong because same-subnet traffic never uses the gateway, so its absence would break internet access, not neighbour-to-neighbour traffic.
A business network uses private IPv4 addresses internally and a single public IPv4 address for internet access. Multiple employees can browse the web simultaneously from different devices. Which mechanism enables this behavior?
Network Address Translation allows many private IP addresses to share one public IP address by translating internal addresses to a single external identity. This enables simultaneous internet access while conserving limited public IPv4 addresses. DHCP and static addressing only assign addresses and do not provide translation.
A technician is planning an upgrade to IPv6 for a mobile device deployment. Management asks why NAT will no longer be required in the new design. Which explanation best justifies this change?
IPv6 uses a 128-bit address space that provides an extremely large number of globally unique addresses. This removes the address exhaustion problem that made NAT necessary in IPv4 networks. Subnetting and configuration mechanisms still exist, but NAT is no longer required for address conservation.
A server hosting an internal business application must always be reachable at the same network address. The environment uses private IPv4 addressing and DHCP for most client systems. Which configuration best meets this requirement while minimizing administrative errors?
Servers that must remain consistently reachable require predictable addressing. Assigning a static IP outside the DHCP range ensures the address does not change or conflict with dynamically assigned devices. Dynamic or APIPA addresses do not provide reliability, and public addressing is unnecessary for an internal-only service.
A technician is designing redundancy for a business network where uninterrupted internet access is critical. Management asks why multiple gateways may be implemented instead of a single router. What is the primary reason for this design choice?
Multiple gateways are used in business environments to prevent a single point of failure. If one gateway becomes unavailable, traffic can be routed through another, maintaining external connectivity. This improves reliability rather than altering addressing or name resolution behavior.
A user reports that a workstation can ping the file server and the DNS server, both of which sit on the same LAN, and it resolves website names correctly, but it cannot reach any server outside the office. The IP address, subnet mask, and DNS settings are verified as correct. Which gateway-related issue best explains this behavior?
Everything local works, including name resolution against the on-LAN DNS server, so the only path that is broken is the one through the default gateway to remote networks; a gateway that is down or unreachable produces exactly this local-only pattern. Incorrect DNS records are wrong because names resolve correctly and the failure is in reaching the resolved addresses, not in looking them up. A private IP address is wrong because every workstation behind a SOHO or business router uses one and NAT still lets it reach the internet. The subnet mask is wrong because masks decide local versus remote, they never filter DNS, and the stem says the mask is correct.
In a small business network, DHCP is used to automatically configure client devices. Several users report they can access the internet, but a newly added workstation cannot. The workstation has no default gateway listed in its IP configuration. What is the most likely underlying issue?
In DHCP-based environments, the gateway address is automatically supplied to clients. If the workstation lacks a default gateway while others function normally, the DHCP configuration or response is likely missing the gateway option, preventing the workstation from routing traffic externally.
A technician is troubleshooting a workstation that can successfully access a shared printer and file server on the local network but cannot reach any external websites. The workstation has a valid IP address and subnet mask. Which configuration issue is the most likely cause?
The ability to communicate with local devices confirms that the IP address and subnet mask are correct. Failure to reach external networks indicates that traffic is not being forwarded outside the local subnet, which is the role of the default gateway. If the gateway is missing or incorrect, only local communication will function.
A technician runs ipconfig on a Windows workstation that cannot reach any network resources and sees an IP address of 169.254.34.18. Which of the following does this address MOST likely indicate?
An address in the 169.254.0.0/16 range is an Automatic Private IP Addressing (APIPA) address, which Windows assigns to itself when it cannot obtain an IPv4 address from a DHCP server. This typically means the physical or local network link is active, but communication with the DHCP server failed, possibly due to a DHCP server outage, an incorrect VLAN, an exhausted scope, or a switch or router problem. A duplicate IP address is incorrect because Windows reports an address conflict rather than assigning a 169.254 address. An incorrect default gateway is incorrect because a gateway problem would still allow the device to hold a valid DHCP-assigned IP address; it simply could not route to other networks. A public IP address from the provider is incorrect because the 169.254 range is reserved as link-local private addressing and is never routable on the public internet. Recognizing an APIPA address is a valuable troubleshooting clue that points the technician toward DHCP or local network path issues rather than physical cabling.
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Every lesson that covers IP Addressing and SOHO Networks on the 220-1201 exam.