CompTIA Network+ N10-009 Dumps PDF

The correct answer is D. Link aggregation. Link aggregation combines multiple physical switch links into one logical connection. This increases available bandwidth and can also add redundancy, all without replacing the switch hardware itself. If users are experiencing slow throughput and the goal is to improve capacity using existing equipment, bundling links is a common and effective solution.

The other options do not directly increase throughput. SVI configuration provides Layer 3 interfaces for VLANs, but it does not add link capacity. VLAN trunking allows multiple VLANs to traverse one connection, but that does not increase bandwidth by itself. 802.1Q tagging identifies VLAN membership on tagged frames; it is related to trunking, not throughput expansion.

In many enterprise environments, link aggregation is implemented through standards such as LACP. This lets several ports act together as one logical channel, which can help distribute traffic more efficiently across the bundled interfaces. For Network+ exam scenarios, when the requirement is to improve throughput using the current switch hardware rather than buying faster switches, link aggregation is the most appropriate answer.

In the router route selection process, the first priority is the longest prefix match, also known as prefix length. According to CompTIA Network+ (N10-009) routing concepts, routers examine the destination IP address in the packet and compare it to entries in the routing table. When multiple routes exist, the router selects the route with the most specific match, meaning the route with the longest subnet mask (largest number of matching bits). For example, a /30 route is preferred over a /24, and a /24 is preferred over a /16 if all match the destination.

Only after the longest prefix match is determined do other factors come into play. Administrative distance (AD) is used to determine which routing source is more trustworthy when the same network is learned from different routing protocols (e.g., OSPF vs. RIP). Metric is then used within the same routing protocol to determine the best path (e.g., hop count, cost, bandwidth). A default route (0.0.0.0/0) is used only when no more specific match exists.

Therefore, prefix length is always evaluated first in route selection.

On Core-SW01, the ports are configured with LACP (mode active) for link aggregation. On Core-SW02, the ports are configured as independent trunks, not as part of an LACP group. Because of this mismatch, LACP cannot form the bundle, and the aggregated ports on SW01 will go into a suspended state.

A. CRC errors suggest cabling or signal integrity issues, not config mismatch.

B. Error disabled occurs when a violation (like BPDU guard or port security) disables the port, not LACP mismatch.

C. Administratively down indicates a shutdown command, not the case here.

References (CompTIA Network+ N10-009):

Domain: Network Troubleshooting — Port-channel/LACP configuration issues, interface states.

When an organization moves its DNS servers to new IP addresses, the NS (Name Server) records must be updated. The NS record defines which DNS servers are authoritative for a domain. Ifthese records still point to the old IP addresses, clients will continue to query the outdated servers, leading to connectivity issues.

Breakdown of Options:

A. AAAA – This record maps a domain name to an IPv6 address. Since the issue is with DNS resolution, not IP versioning, this is incorrect.

B. CNAME – A CNAME (Canonical Name) record is used for domain aliasing, not for defining authoritative name servers.

C. MX – Mail Exchange (MX) records direct email traffic to the correct mail server, which does not impact general website accessibility.

D. NS – Correct answer. NS records must be updated to reflect the new authoritative DNS servers.