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[General] N10-009 Latest Material - N10-009 Top Questions

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【General】 N10-009 Latest Material - N10-009 Top Questions

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CompTIA N10-009 Exam Syllabus Topics:
TopicDetails
Topic 1
  • Networking Concepts: For network administrators and IT support professionals, this domain covers
Topic 2
  • OSI reference model concepts, Comparison of networking appliances, applications, and functions
Topic 3
  • Cloud concepts and connectivity options, and Common networking ports.

CompTIA Network+ Certification Exam Sample Questions (Q171-Q176):NEW QUESTION # 171
What happens to users' internet traffic in a split-tunneling VPN?
  • A. All corporate and public resources are accessed through routing to on-site servers.
  • B. ACLs are used to balance network traffic through different connections.
  • C. Only public resources are accessed through the user's internet connection.
  • D. Encrypted resources are accessed through separate tunnels.
Answer: C
Explanation:
In a split-tunnel VPN, only corporate traffic is sent through the VPN tunnel, while public internet traffic goes directly through the user's local ISP. This reduces bandwidth use on the corporate VPN concentrator and improves performance for non-work traffic.
* B. Separate tunnels for encrypted traffic describes multi-tunnel VPNs, not split tunneling.
* C. All traffic routed through on-site servers is a full-tunnel VPN, not split-tunnel.
* D. ACLs balancing traffic relates to routing or load balancing, not VPN split tunneling.
References (CompTIA Network+ N10-009):
* Domain: Networking Concepts - VPN types, split vs. full tunnel, remote access.

NEW QUESTION # 172
A network engineer performed a migration to a new mail server. The engineer changed the MX record, verified the change was accurate, and confirmed the new mail server was reachable via the IP address in the A record. However, users are not receiving email. Which of the following should the engineer have done to prevent the issue from occurring?
  • A. Reduce the TTL record prior to the MX record change.
  • B. Perform a DNS zone transfer prior to the MX record change.
  • C. Update the NS record to reflect the IP address change.
  • D. Change the email client configuration to match the MX record.
Answer: A
Explanation:
Understanding TTL (Time to Live):
TTL is a value in a DNS record that tells how long that record should be cached by DNS servers and clients.
A higher TTL value means that the record will be cached longer, reducing the load on the DNS server but delaying the propagation of changes.
Impact of TTL on DNS Changes:
When an MX record change is made, it may take time for the change to propagate across all DNS servers due to the TTL setting. If the TTL is high, old DNS information might still be cached, leading to email being directed to the old server.
Best Practice Before Making DNS Changes:
To ensure that changes to DNS records propagate quickly, it is recommended to reduce the TTL value to a lower value (such as 300 seconds or 5 minutes) well in advance of making the changes. This ensures that any cached records will expire quickly, and the new records will be used sooner.
Verification of DNS Changes:
After reducing the TTL and making the change to the MX record, it is important to verify the propagation using tools like dig or nslookup.
Comparison with Other Options:
Change the email client configuration to match the MX record: Email clients generally do not need to match the MX record directly; they usually connect to a specific mail server specified in their settings.
Perform a DNS zone transfer prior to the MX record change: DNS zone transfers are used to replicate DNS records between DNS servers, but they are not related to the propagation of individual record changes.
Update the NS record to reflect the IP address change: NS records specify the DNS servers for a domain and are not related to MX record changes.
References:
CompTIA Network+ study materials and DNS best practices.

NEW QUESTION # 173
Which of the following routing technologies uses an attribute list for path selection?
  • A. BGP
  • B. RIP
  • C. EIGRP
  • D. OSPF
Answer: A
Explanation:
BGP (Border Gateway Protocol) uses attributes like AS path, origin, and MED (multi-exit discriminator) to determine the best path among multiple available routes.
From Andrew Ramdayal's guide:
"BGP is the protocol underlying the global routing system of the internet. It is used for routing data between autonomous systems (ASes)... BGP uses a path vector mechanism and maintains a list of attributes for route selection."

NEW QUESTION # 174
A network administrator configured a router interface as 10.0.0.95 255.255.255.240. The administrator discovers that the router is not routing packets to a web server with IP 10.0.0.81/28. Which of the following is the best explanation?
  • A. Therouter interface isa broadcast address.
  • B. Thesubnet is in a private address space.
  • C. TheIP address spaceis a class A network.
  • D. Theweb server Is In adifferent subnet.
Answer: A

NEW QUESTION # 175
A research facility is expecting to see an exponential increase in global network traffic in the near future. The offices are equipped with 2.5Gbps fiber connections from the ISP, but the facility is currently only utilizing 1Gbps connections. Which of the following would need to be configured in order to use the ISP's connection speed?
  • A. Link aggregation
  • B. Network address translation
  • C. Port duplex
  • D. 802.1Q tagging
Answer: A
Explanation:
Understanding Link Aggregation:
Definition: Link aggregation combines multiple network connections into a single logical link to increase bandwidth and provide redundancy.
Usage in High-Bandwidth Scenarios:
Combining Links: By aggregating multiple 1Gbps connections, the facility can utilize the full 2.5Gbps bandwidth provided by the ISP.
Benefits: Enhanced throughput, load balancing, and redundancy, ensuring better utilization of available bandwidth.
Comparison with Other Options:
802.1Q Tagging: Used for VLAN tagging, which does not affect the physical bandwidth utilization.
Network Address Translation (NAT): Used for IP address translation, not related to link speed or bandwidth aggregation.
Port Duplex: Refers to the mode of communication (full or half duplex) on a port, not the aggregation of bandwidth.
Implementation:
Configure link aggregation (often referred to as LACP - Link Aggregation Control Protocol) on network devices to combine multiple physical links into one logical link.
Reference:
CompTIA Network+ study materials on network configuration and link aggregation.

NEW QUESTION # 176
......
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