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| Section | Weight | Objectives |
|---|---|---|
| Networking Concepts | 23% | - Network addressing and protocols
|
| Network Implementation | 20% | - Routing technologies
|
| Network Operations | 19% | - Monitoring and management
|
| Network Security | 14% | - Compliance and risk
|
| Network Troubleshooting | 24% | - Common network issues
|
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NEW QUESTION # 509
Computer A cannot reach Computer B in the following network:
Computer A: 172.16.2.10/16
Computer B: 172.16.4.10/16
Switch A:
Gi0/1 access VLAN 1, status up/up
Gi0/9 access VLAN 8, status up/up
Gi0/10 access VLAN 5, status administratively down
Switch B:
Gi0/1 access VLAN 1, status up/up
Gi0/9 access VLAN 8, status up/up
Gi0/10 access VLAN 5, status administratively down
Which of the following will resolve the issue?
Answer: D
Explanation:
The correct solution is to establish a trunk connection between Switch A and Switch B. Computer A and Computer B are both connected to access VLAN 1 on their local switches. However, the inter-switch link appears to be configured as an access port in VLAN 8. Because the link between the switches is not carrying VLAN 1 traffic, devices in VLAN 1 on separate switches cannot communicate across that connection.
The CompTIA Network+ N10-009 objectives include VLANs, switching, trunking, access ports, and troubleshooting Layer 2 connectivity. Access ports carry traffic for a single VLAN. Trunk ports carry traffic for multiple VLANs between switches, usually using tagging such as IEEE 802.1Q. To allow VLAN 1 devices on both switches to communicate, the inter-switch connection must carry VLAN 1 traffic. A trunk would allow VLAN 1 and other required VLANs to pass between the switches.
Link aggregation is not the issue, and Gi0/10 is administratively down. Spanning Tree Protocol prevents loops but does not fix missing VLAN transport. Changing both hosts to a /24 would not solve the VLAN separation problem and could make IP reachability worse. Therefore, trunking is required.
NEW QUESTION # 510
Which of the following most likely requires the use of subinterfaces?
Answer: D
Explanation:
Introduction to Subinterfaces:
Subinterfaces are logical interfaces created on a single physical interface. They are used to enable a router to support multiple networks on a single physical interface.
Use Case for Subinterfaces:
Subinterfaces are commonly used in scenarios where VLANs are implemented. A router with a single physical LAN port can be configured with multiple subinterfaces, each associated with a different VLAN.
NEW QUESTION # 511
A network administrator needs to change where the outside DNS records are hosted. Which of the following records should the administrator change the registrar to accomplish this task?
Answer: B
Explanation:
To change where the outside DNS records are hosted, the network administrator needs to update the NS (Name Server) records at the domain registrar. NS records specify the authoritative name servers for a domain, directing where DNS queries should be sent.
* NS (Name Server) Records: These records indicate the servers that are authoritative for a domain.
Changing the NS records at the registrar points DNS resolution to the new hosting provider.
* SOA (Start of Authority): Contains administrative information about the domain, including the primary name server.
* PTR (Pointer) Records: Used for reverse DNS lookups, mapping IP addresses to domain names.
* CNAME (Canonical Name) Records: Used to alias one domain name to another, not relevant for changing DNS hosting.
Network References:
* CompTIA Network+ N10-007 Official Certification Guide: Discusses DNS records, their purposes, and how to manage them.
* Cisco Networking Academy: Provides training on DNS management and the role of different DNS record types.
* Network+ Certification All-in-One Exam Guide: Explains DNS records and their configuration for domain management.
NEW QUESTION # 512
As part of an attack, a threat actor purposefully overflows the content-addressable memory (CAM) table on a switch. Which of the following types of attacks is this scenario an example of?
Answer: B
Explanation:
* Definition of MAC Flooding:
* MAC flooding is an attack where a malicious actor sends numerous fake MAC addresses to a switch, overwhelming its CAM table. The CAM table stores MAC addresses and their associated ports for efficient traffic forwarding.
* Impact of MAC Flooding:
* CAM Table Overflow: When the CAM table is full, the switch cannot learn new MAC addresses and is forced to broadcast traffic to all ports, leading to a degraded network performance and
* potential data interception.
* Switch Behavior: The switch operates in a fail-open mode, treating the network as a hub, which can be exploited for eavesdropping on traffic.
* Comparison with Other Attacks:
* ARP Spoofing: Involves sending false ARP (Address Resolution Protocol) messages to associate the attacker's MAC address with the IP address of another device.
* Evil Twin: Involves creating a rogue wireless access point that mimics a legitimate one to intercept data.
* DNS Poisoning: Involves corrupting the DNS cache with false information to redirect traffic to malicious sites.
* Preventive Measures:
* Port Security: Configure port security on switches to limit the number of MAC addresses per port, preventing CAM table overflow.
* Network Segmentation: Use VLANs to segment network traffic and limit the impact of such attacks.
References:
* CompTIA Network+ study materials on network security threats and mitigation techniques.
NEW QUESTION # 513
Which of the following is used to describe the average duration of an outage for a specific service?
Answer: B
NEW QUESTION # 514
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