Authentic CompTIA Certification Exam N10-008 Questions Answers

The availability concept that the network technician should consider when selecting new network hardware is RTO (Recovery Time Objective). RTO is a metric that defines the maximum acceptable time for restoring a system or service after a disruption or failure. RTO is based on the impact and cost of downtime for the business and its customers. RTO helps determine the level of redundancy and backup needed for network hardware to ensure high availability and minimize downtime. References: CompTIA Network+ N10-008 Certification Study Guide, page 346; The Official CompTIA Network+ Student Guide (Exam N10-008), page 13-9.

802.1Q configuration is the most likely cause of the issue where a switch interface is not forwarding frames on a trunked port. 802.1Q is a standard that defines how to create and manage virtual LANs (VLANs) on a switched network. VLANs are logical segments of a network that group devices based on criteria such as function, department, or security level. VLANs can improve network performance, security, and manageability by reducing broadcast domains, isolating traffic, and enforcing policies. A trunked port is a switch port that can carry traffic from multiple VLANs over a single physical link by adding a VLAN tag to each frame. A VLAN tag is a 4-byte header that identifies the VLAN ID and priority of each frame. A trunked port requires 802.1Q configuration to specify which VLANs are allowed or disallowed on the port, and which VLAN is the native or untagged VLAN. If the 802.1Q configuration is incorrect or mismatched between switches, frames may be dropped or misrouted on the trunked port. References: [CompTIA Network+ Certification Exam Objectives], VLAN Trunking Protocol (VTP) Explained | NetworkLessons.com

• The question describes a scenario where a network event is causing all communication to stop, and the network administrator can only access the switch using the serial console port, not SSH.
• This suggests that the problem is related to the network layer or below, as SSH operates at the application layer and requires network connectivity to function.
• The port statistics show a huge discrepancy between the total receive and transmit rates, as well as the unicast and broadcast/multicast packets per second. This indicates that there is a lot of traffic being generated and forwarded within the network, but not reaching the intended destinations.
• The most likely cause of this excessive traffic is a switch loop, which occurs when there are multiple paths between switches that create a circular flow of data. Switch loops can cause broadcast storms, MAC address table instability, and network congestion, leading to network outages.
• To verify this, the network administrator should use a tool such as Spanning Tree Protocol (STP), which is designed to prevent and detect switch loops by blocking redundant links and electing a root bridge. STP can also provide information about the topology and status of the network, such as the root port, designated port, and blocked port for each switch. References:
• CompTIA Network+ N10-008 Study Guide, Chapter 2, Section 2.3, Switching Technologies, page 741
• Professor Messer’s CompTIA N10-008 Network+ Course Notes, Section 2.3, Switching Technologies, page 132
• Professor Messer’s CompTIA N10-008 Network+ Training Course, Video 2.3 - Switching Technologies, 12:00 - 14:003