APIPA

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• APIPA Explanation OBJ-1.4: APIPA stands for Automatic Private IP Addressing and is a feature of Windows operating systems. When a client computer is configured to use automatic addressing (DHCP), APIPA assigns a class B IP address from 169.254.0.0 to 169.254.255.255 to the client if the DHCP server is unavailable. A static IP address is used when the DHCP server is disabled and clients are configured manually to join the network properly. A public IP address is the outward- facing (public-facing) IP address assigned to a client. A private IP address lets a router correctly direct traffic within its network and allows devices within a network to communicate with one another, but private IP addresses cannot be used to route traffic across the internet. Question 4: Correct Last night, your company's system administrators conducted a server upgrade. This morning, several users are having issues accessing the company's shared drive on the network. You have been asked to troubleshoot the problem. What document should you look at first to create a probable theory for the cause of the issue? • change management documentation Explanation OBJ-3.2: Since everything worked before the server upgrade and doesn't now, it would be a good idea to first look at the change management documentation that authorized the change/upgrade. This should include the specific details of what was changed and what things may have been affected by the change. This is the best place to start when determining what changed since yesterday. Change management is a systematic approach to dealing with the transition or transformation of an organization's goals, processes, or technologies. Question 5: Correct A network administrator has determined that the ingress and egress traffic of a router’s interface are not correctly reported to the monitoring server. Which of the following can be used to determine if the router interface uses 64 bit versus 32-bit counters? • SNMP Walk Explanation OBJ-3.1: SNMP Walk can be used to determine if the counter is using 32 bits or 64 bits by querying the OID of the endpoint (router interface). This is a complex topic beyond the scope of the Network+ exam (how to use the SNMP Walk tool) and usually serves as a type of in-depth question that CompTIA might ask to determine if a candidate has actual real-world experience in networking or just studied from a textbook. Some instructors like to claim that CompTIA uses these types of questions to determine if someone is cheating because only people who studied from a "brain dump" are likely to get this question correct! This type of question reminds you that it is ok not to know all the answers on test day. Just take your best guess, and then move on! Question 6: Correct Today, your company's network started to experience network connectivity issues for various workstations around the company. As you begin troubleshooting, you identify that all the workstations receive their connectivity from a single switch on the 3rd floor of the

office building. You start searching the 3rd floor for the cause of this issue and find a small wired router plugged into a network jack in the sales manager's office. From this small wired router, he has connected his workstation and a small Smart TV to watch Netflix while working. You question the sales manager about when he brought in the new router. He states that he just hooked it up this morning. What type of issue did the sales manager accidentally introduced into the network by installing the router? • Routers DHCP servers Explanation OBJ-5.5: Routers usually contain their own DHCP servers. When the sales manager installed the wired router, he inadvertently introduced a secondary DHCP server into the network. This could cause the same IP addresses to be assigned to two different workstations, resulting in connectivity issues for those workstations. Had the sales manager installed a simple hub or switch, this would not have caused any issues. Because this is a wired router, it cannot be an evil twin since evil twins are wireless access points. We have no indications of a VLAN mismatch since this would only affect the workstations connected to this router. Similarly, we have no indications of a network loop, so this network might already be implementing STP to prevent them. Remember, always ask yourself, "what changed recently that might have caused this issue?" In this case, it was the new router added this morning by the sales manager. Question 7: Correct A company owns four kiosks that are near a shopping center. The owner is concerned about someone accessing the Internet via the kiosk's wireless network. What should be implemented to provide wireless access only to the employees working at the kiosk? • MAC Filtering Explanation OBJ-4.3: MAC Filtering will control access to the network by restricting access to only certain devices. MAC address filtering allows you to block traffic coming from certain known machines or devices. The router uses the MAC address of a computer or device on the network to identify it and block or permit access. Traffic coming in from a specified MAC address will be filtered depending upon the policy. In this scenario, you should implement an allow list that only allows approved MAC addresses to connect to and communicate over the wireless network. Question 8: Correct Which of the following IEEE specifications describes the use of power over ethernet (POE)? • 802.3af Explanation OBJ-2.3: Power over Ethernet (POE) is a technology that lets network cables carry electrical power. POE is defined in the IEEE 802.3af. The Spanning Tree Protocol (STP) is a network protocol that builds a loop-free logical topology for Ethernet networks to prevent bridge loops and the broadcast storms that result from them. STP is defined in the IEEE 802.1d standard. Link Aggregation Control Protocol or LACP is one element of an IEEE specification (802.3ad) that

provides guidance on the practice of link aggregation for data connections. The IEEE 802.1x standard is a network authentication protocol that opens ports for network access when an organization authenticates a user's identity and authorizes them for access to the network. This defines port security. The user's identity is determined based on their credentials or certificate, which is confirmed by the RADIUS server. Question 9: Correct Which of the following policies or plans would dictate which type of virtual private network connections will be authorized for use by an organization's employees? • remote access policy Explanation OBJ-3.2: A remote access policy is a document which outlines and defines acceptable methods of remotely connecting to the internal network. A password policy is a set of rules created to improve computer security by motivating users to create dependable, secure passwords and then store and utilize them properly. This document promotes strong passwords by specifying a minimum password length, complexity requirements, requiring periodic password changes, and placing limits on the reuse of passwords. An acceptable use policy (AUP) is a set of rules applied by the owner, creator, or administrator of a network, website, or service, that restrict the ways in which the network, website, or system may be used and sets guidelines as to how it should be used. A data loss prevention policy is a document that defines how organizations can share and protect data. It guides how data can be used in decision-making without it being exposed to anyone who should not have access to it. The goal of a data loss prevention policy is to minimize accidental or malicious data loss. Question 10: Correct What is the broadcast address associated with the host located at 10.10.10.200/25? • • • • Explanation OBJ-1.4: In classless subnets using variable-length subnet mask (VLSM), the broadcast address is the last IP address associated within an assigned range. In this example, the CIDR notation is /25, so each subnet will contain 128 IP addresses. Since the IP address provided is 10.10.10.200, the broadcast address will be 10.10.10.255. Question 11: Correct You have been asked to install a media converter that connects a newly installed RG-6 cable to the existing single-mode cable plant. Which type of media converter should you use? • • • •

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Explanation OBJ-1.3: A media converter is a Layer 1 device that changes one type of physical network connection to another. In this case, we are converting coaxial (RG-6) cable to fiber -optic (SMF) cable. Question 12: Correct You have just moved into a new apartment in a large building. Your wireless network is acting strangely, so you are worried that it may be due to interference from the numerous other wireless networks in each of the other apartments in this building. You want to determine what wireless signals are within the walls of your apartment and their relative strength. What technique should you utilize to determine whether the nearby wireless networks are causing interference with your own Wi-Fi network?

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