Medium N10-009 practice questions

A technician is deploying three access points in the 2.4 GHz band across a small office to provide overlapping coverage without co-channel interference. Which set of channels should be configured on the three APs to avoid overlapping frequencies in North America?

A company is deploying wireless access points in a newly renovated conference center that frequently hosts large events with hundreds of attendees. The IT team reports severe congestion and co-channel interference on the existing network, which operates only on the 2.4 GHz and 5 GHz bands. Management wants the new deployment to take advantage of a wide, uncongested spectrum with many non-overlapping channels to support high client density. Which wireless standard should the team specify for the new access points?

A company is deploying new access points in a densely populated office building. The IT team wants maximum throughput for modern laptops and phones while minimizing interference from neighboring businesses' networks and common office devices like microwaves and Bluetooth peripherals. Which frequency band should be prioritized for these high-performance clients?

A network technician configures an interface between two switches to carry traffic for VLANs 10, 20, and 30. On this link, how are frames from each VLAN distinguished as they traverse the connection?

A security team wants to ensure that every device connecting to a wired switch port must present valid credentials before it is granted any network access. Devices that fail authentication should be denied or placed into a restricted VLAN. Which technology best meets this requirement?

A network administrator is deploying port-based authentication so that laptops must prove their identity before gaining LAN access. In the 802.1X framework, the switch relays credentials but does not validate them itself. Which component is responsible for actually verifying the submitted credentials and returning an accept or reject decision?

During a compliance audit, an assessor asks the network administrator to produce a report showing which administrators logged into the core switches, what commands they executed, and how long each session lasted. The organization uses a centralized AAA server. Which component of the AAA framework provides this information?

A network administrator configures an ACL on a router interface to permit HTTP and HTTPS traffic from the guest VLAN to a specific web server. After applying the ACL, guest users report they can no longer reach the DNS server or any other internal resources, even though no explicit deny statement was written for those. What is the MOST likely cause of this behavior?

A network engineer is designing a high-availability solution for a pair of firewalls that must handle peak traffic loads. The business requires that both firewalls actively pass traffic during normal operations so that the full combined throughput of both devices is available, while still providing redundancy if one fails. Which redundancy configuration best meets these requirements?

A global company operates authoritative DNS servers in data centers on three continents. They want clients worldwide to automatically reach the topologically nearest DNS server using a single shared IP address, with traffic rerouting to another site if one goes offline. Which traffic type should be used to achieve this?

A technician is called to a workstation that cannot reach any network resources or the internet. Running ipconfig shows the machine has an IPv4 address of 169.254.14.72 with a subnet mask of 255.255.0.0 and no default gateway listed. Other devices on the same LAN are working normally. What is the MOST likely cause?

A workstation loses connectivity to a server after the server's network card was replaced with a new one bearing a different MAC address. The workstation can ping other hosts on the same subnet fine, and the server responds to pings from every host except this one workstation. Using CLI tools, you notice the workstation still lists the server's IP mapped to the OLD MAC address. Which command should you run on the workstation to immediately resolve the issue?

A technician suspects that two hosts on the same subnet are experiencing intermittent connectivity because a workstation may be caching an outdated hardware address for the default gateway. The technician wants to inspect and, if necessary, clear the local table that maps IP addresses to MAC addresses on the affected workstation. Which command-line tool should the technician use?

Users on a corporate LAN report intermittent connectivity, and a security analyst notices that the gateway's MAC address in several hosts' ARP caches keeps changing to an unexpected value. Traffic that should reach the internet appears to be routed through an unknown internal host first. Which type of attack is most likely occurring?

A technician installs a new workstation in a warehouse. The Ethernet cable runs from a switch in the IDF, through a cable tray, and terminates at a wall jack roughly 130 meters away. The workstation intermittently drops its link and negotiates at only 100 Mbps despite being connected to a Gigabit switch. A cable tester shows correct wiremap and no shorts or opens. What is the MOST likely cause?

A user reports that their workstation loses network connectivity several times a day. A technician replaces the patch cable and the port stays up longer but still drops. The interface counters on the switch show a steadily increasing number of alignment and CRC errors, and wiggling the cable at the wall jack momentarily restores the link. What is the MOST likely cause?

A company is establishing a direct connection to two different Internet service providers to achieve redundancy and control which provider is used for outbound traffic based on organizational policy. The network engineer needs to select a routing protocol that can exchange routes between the company's network and both ISPs, each of which operates as a separate administrative entity. Which routing protocol is designed for this requirement?

A network technician must connect a new access switch to a workgroup switch located 90 meters away in the same building. The link needs to support 10 Gbps throughput, and management wants to reuse the existing structured copper cabling infrastructure rather than install fiber. Which transmission medium should the technician select to reliably meet these requirements?

A media streaming company hosts its website and video library on servers located in a single data center in New York. Users in Europe and Asia complain about slow page loads and buffering when watching videos, while North American users report acceptable performance. The company wants to improve the experience for its global audience without relocating or duplicating its primary application servers. Which solution best addresses this problem?

A network engineer submits a change request to upgrade the firmware on the core switches during a maintenance window. The change advisory board reviews the request but sends it back, stating that one critical element is missing that must be documented before approval. This element describes the specific steps to return the switches to their previous working state if the firmware upgrade causes an outage. Which element is the board requiring?

A security team distributes firmware updates to remote branch routers. They want a way to let each branch verify that the downloaded firmware file has not been altered in transit or tampered with before installation. Which aspect of the CIA triad are they primarily addressing, and which technique best supports it?

A small nonprofit with a limited budget wants an offsite disaster recovery location. Management states that if the primary site fails, the organization can tolerate several days of downtime while equipment is procured, delivered, and configured. They want to minimize ongoing recurring costs as much as possible. Which type of recovery site best fits these requirements?

A network administrator makes several changes to a core switch's running configuration each week. After a recent faulty update caused an outage, management asks for a system that stores every past version of the device configuration so the team can compare revisions and restore a known-good copy on demand. Which practice best meets this requirement?

A technician pushed a configuration change to a distribution switch that accidentally disabled all its management IP interfaces, and the device is now unreachable over SSH from the network. The switch is still powered and passing user traffic. What is the MOST appropriate way for the technician to regain administrative access to correct the mistake?

A technician is investigating slow file transfers between a workstation and a server that traverses a single access switch. The switch port connected to the workstation shows a steadily increasing count of CRC errors, late collisions, and runts, while throughput drops sharply under load. The switch port is hardcoded to 100 Mbps full duplex, and the workstation NIC is set to auto-negotiate. What is the MOST likely cause of these symptoms?