Practice Free N10-009 Exam Online Questions
Question #121
Which of the following does BGP use for loop avoidance?
- A . Autonomous system path
- B . Peer autonomous system
- C . Autonomous system length
- D . Public autonomous system
Correct Answer: A
A
Explanation:
The correct answer is Autonomous system path because BGP (Border Gateway Protocol) prevents routing loops by using the AS_PATH attribute. According to CompTIA Network+ (N10-009) objectives under routing protocols, BGP is a path vector protocol used to exchange routing information between autonomous systems (AS) on the internet.
When a BGP router advertises a route, it includes its autonomous system number (ASN) in the
AS_PATH attribute. As the route passes through additional autonomous systems, each AS appends its own ASN to the path. If a BGP router receives a route advertisement that already contains its own ASN in the AS_PATH list, it recognizes this as a loop and rejects the route. This mechanism effectively prevents routing loops across large-scale networks such as the internet.
Option B (Peer autonomous system) refers to neighboring BGP routers but does not describe the loop prevention mechanism.
Option C (Autonomous system length) relates to path selection metrics, as shorter AS_PATH lengths are generally preferred, but this is not the loop avoidance function itself.
Option D (Public autonomous system) is not a loop prevention mechanism.
Therefore, BGP uses the AS_PATH attribute for loop avoidance.
A
Explanation:
The correct answer is Autonomous system path because BGP (Border Gateway Protocol) prevents routing loops by using the AS_PATH attribute. According to CompTIA Network+ (N10-009) objectives under routing protocols, BGP is a path vector protocol used to exchange routing information between autonomous systems (AS) on the internet.
When a BGP router advertises a route, it includes its autonomous system number (ASN) in the
AS_PATH attribute. As the route passes through additional autonomous systems, each AS appends its own ASN to the path. If a BGP router receives a route advertisement that already contains its own ASN in the AS_PATH list, it recognizes this as a loop and rejects the route. This mechanism effectively prevents routing loops across large-scale networks such as the internet.
Option B (Peer autonomous system) refers to neighboring BGP routers but does not describe the loop prevention mechanism.
Option C (Autonomous system length) relates to path selection metrics, as shorter AS_PATH lengths are generally preferred, but this is not the loop avoidance function itself.
Option D (Public autonomous system) is not a loop prevention mechanism.
Therefore, BGP uses the AS_PATH attribute for loop avoidance.
Question #122
Which of the following protocols is used to route traffic on the public internet?
- A . BGP
- B . OSPF
- C . EIGRP
- D . RIP
Correct Answer: A
A
Explanation:
Border Gateway Protocol (BGP) is the primary protocol used to route traffic on the public internet. It allows ISPs and large networks to exchange routing information, making it an Exterior Gateway Protocol (EGP).
Breakdown of Options:
A
Explanation:
Border Gateway Protocol (BGP) is the primary protocol used to route traffic on the public internet. It allows ISPs and large networks to exchange routing information, making it an Exterior Gateway Protocol (EGP).
Breakdown of Options:
Question #123
An administrator is configuring a switch that will be placed in an area of the office that is accessible to customers.
Which of the following is the best way for the administrator to mitigate unknown devices from connecting to the network?
- A . SSE
- B . ACL
- C . Perimeter network
- D . 802.1x
Correct Answer: D
D
Explanation:
D
Explanation:
Question #124
Which of the following connector types would most likely be used to connect to an external antenna?
- A . BNC
- B . ST
- C . LC
- D . MPO
Correct Answer: A
A
Explanation:
BNC connectors are commonly used for coaxial cables, including those connecting to external antennas in Wi-Fi, radio, and surveillance systems.
Breakdown of Options:
A
Explanation:
BNC connectors are commonly used for coaxial cables, including those connecting to external antennas in Wi-Fi, radio, and surveillance systems.
Breakdown of Options:
Question #125
A network administrator performed upgrades on a server and installed a new NIC to improve performance. Following the upgrades, usera are unable to reach the server.
Which of the following is the most likely reason.
- A . The PoE power budget was exceeded.
- B . TX/RX was transposed.
- C . A port security violation occured.
- D . An incorrect cable type was installed.
Correct Answer: D
D
Explanation:
When a network administrator installs a new Network Interface Card (NIC) and users are unable to reach the server, one of the common issues is the use of an incorrect cable type. Network cables must match the specifications required by the NIC and the network infrastructure (e.g., Cat5e, Cat6 for Ethernet).
NIC Compatibility: The new NIC might require a specific type of cable to function properly. Using a cable not rated for the NIC’s required speeds or capabilities can result in connectivity issues.
Cable Standards: Different NICs and network devices might need different cabling standards (straight-through vs. crossover cables, or specific fiber optic types).
Connection Types: Ensuring that the cable connectors are appropriate for the NIC ports (e.g., RJ45 for Ethernet, LC connectors for fiber optics).
Network
Reference: CompTIA Network+ N10-007 Official Certification Guide: Discusses network cabling standards and NIC specifications.
Cisco Networking Academy: Provides insights into cabling and NIC configurations for optimal network performance.
Network+ Certification All-in-One Exam Guide: Offers comprehensive details on troubleshooting network connectivity issues, including cabling problems.
D
Explanation:
When a network administrator installs a new Network Interface Card (NIC) and users are unable to reach the server, one of the common issues is the use of an incorrect cable type. Network cables must match the specifications required by the NIC and the network infrastructure (e.g., Cat5e, Cat6 for Ethernet).
NIC Compatibility: The new NIC might require a specific type of cable to function properly. Using a cable not rated for the NIC’s required speeds or capabilities can result in connectivity issues.
Cable Standards: Different NICs and network devices might need different cabling standards (straight-through vs. crossover cables, or specific fiber optic types).
Connection Types: Ensuring that the cable connectors are appropriate for the NIC ports (e.g., RJ45 for Ethernet, LC connectors for fiber optics).
Network
Reference: CompTIA Network+ N10-007 Official Certification Guide: Discusses network cabling standards and NIC specifications.
Cisco Networking Academy: Provides insights into cabling and NIC configurations for optimal network performance.
Network+ Certification All-in-One Exam Guide: Offers comprehensive details on troubleshooting network connectivity issues, including cabling problems.
Question #126
Early in the morning, an administrator installs a new DHCP server. In the afternoon, some users report they are experiencing network outages.
Which of the following is the most likely issue?
- A . Theadministrator didnot provisionenough IP addresses.
- B . Theadministrator configured an incorrect default gateway.
- C . Theadministrator didnot provisionenough routes.
- D . Theadministrator didnot provisionenough MAC addresses.
Correct Answer: A
A
Explanation:
When a DHCP server is installed and not enough IP addresses are provisioned, users may start experiencing network outages once the available IP addresses are exhausted. DHCP servers assign IP addresses to devices on the network, and if the pool of addresses is too small, new devices or those renewing their lease may fail to obtain an IP address, resulting in network connectivity issues.
Reference: CompTIA Network+ study materials.
A
Explanation:
When a DHCP server is installed and not enough IP addresses are provisioned, users may start experiencing network outages once the available IP addresses are exhausted. DHCP servers assign IP addresses to devices on the network, and if the pool of addresses is too small, new devices or those renewing their lease may fail to obtain an IP address, resulting in network connectivity issues.
Reference: CompTIA Network+ study materials.
Question #127
A network administrator is responding to a request to configure a new IP phone.
Which of the following should the network administrator do to allow data and voice traffic to be properly prioritized?
- A . Configure full duplex.
- B . Modify QoS.
- C . Enable 802.1Q tagging.
- D . Change the native VLAN.
Correct Answer: B
B
Explanation:
To ensure voice and data traffic are properly prioritized for an IP phone, the administrator should modify (configure) QoS. In Network+ (N10-009), QoS is the primary mechanism used to prioritize latency-sensitive traffic such as VoIP. By classifying and marking voice frames/packets (often using DSCP/CoS values) and applying priority queuing, the network ensures voice traffic experiences minimal delay and jitter even when links are congested. This is essential for call quality because voice is highly sensitive to variation in delivery time and packet loss.
B
Explanation:
To ensure voice and data traffic are properly prioritized for an IP phone, the administrator should modify (configure) QoS. In Network+ (N10-009), QoS is the primary mechanism used to prioritize latency-sensitive traffic such as VoIP. By classifying and marking voice frames/packets (often using DSCP/CoS values) and applying priority queuing, the network ensures voice traffic experiences minimal delay and jitter even when links are congested. This is essential for call quality because voice is highly sensitive to variation in delivery time and packet loss.
Question #128
Which of the following network traffic type is sent to all nodes on the network?
- A . Unicast
- B . Broadcast
- C . Multicast
- D . Anycast
Correct Answer: B
B
Explanation:
Broadcast traffic is sent to all nodes on the network. In a broadcast, a single packet is transmitted to all devices in the network segment. This is commonly used for tasks like ARP (Address Resolution Protocol) requests.
Broadcast Domain: All devices within the same broadcast domain will receive broadcast traffic.
Network Types: Ethernet networks commonly use broadcast traffic for certain functions, including
network discovery and addressing.
IPv4 Broadcast: An IPv4 broadcast address (e.g., 255.255.255.255) ensures the packet is sent to all devices on the network.
Network
Reference: CompTIA Network+ N10-007 Official Certification Guide: Explains network traffic types, including broadcast, unicast, and multicast.
Cisco Networking Academy: Provides training on network communication methods and traffic types.
Network+ Certification All-in-One Exam Guide: Discusses different types of network traffic and their uses in various network scenarios.
Broadcast traffic is essential for network operations that require communication with all nodes, such as ARP requests or DHCP discovery messages.
B
Explanation:
Broadcast traffic is sent to all nodes on the network. In a broadcast, a single packet is transmitted to all devices in the network segment. This is commonly used for tasks like ARP (Address Resolution Protocol) requests.
Broadcast Domain: All devices within the same broadcast domain will receive broadcast traffic.
Network Types: Ethernet networks commonly use broadcast traffic for certain functions, including
network discovery and addressing.
IPv4 Broadcast: An IPv4 broadcast address (e.g., 255.255.255.255) ensures the packet is sent to all devices on the network.
Network
Reference: CompTIA Network+ N10-007 Official Certification Guide: Explains network traffic types, including broadcast, unicast, and multicast.
Cisco Networking Academy: Provides training on network communication methods and traffic types.
Network+ Certification All-in-One Exam Guide: Discusses different types of network traffic and their uses in various network scenarios.
Broadcast traffic is essential for network operations that require communication with all nodes, such as ARP requests or DHCP discovery messages.
Question #129
Which of the following would most likely be utilized to implement encryption in transit when using HTTPS?
- A . SSH
- B . TLS
- C . SCADA
- D . RADIUS
Correct Answer: B
B
Explanation:
TLS (Transport Layer Security) is the protocol that provides encryption in transit for HTTPS. It ensures data is encrypted between the client (browser) and the web server, protecting it from interception or tampering.
B
Explanation:
TLS (Transport Layer Security) is the protocol that provides encryption in transit for HTTPS. It ensures data is encrypted between the client (browser) and the web server, protecting it from interception or tampering.
Question #130
Which of the following most directly secures sensitive information on a network?
- A . Data-in-transit encryption
- B . Principle of least privilege
- C . Role-based access controls
- D . Multifactor authentication
Correct Answer: A
A
Explanation:
The option that most directly secures sensitive information on the network is data-in-transit
encryption. This ensures that data packets are unreadable to attackers who intercept them while moving across the network. Protocols such as TLS, HTTPS, IPsec, and SSH protect confidentiality and integrity of sensitive information.
B. Principle of least privilege (PoLP) secures access control but does not directly protect data in motion.
C. Role-based access control (RBAC) enforces permissions but again does not secure the data while transmitted.
D. Multifactor authentication (MFA) strengthens identity verification but does not directly protect the data itself once transmitted.
Thus, while all options contribute to overall security, encryption of data-in-transit most directly addresses protection of sensitive information on the network.
Reference (CompTIA Network+ N10-009):
Domain: Network Security ― Encryption methods, confidentiality, data-in-transit protection.
A
Explanation:
The option that most directly secures sensitive information on the network is data-in-transit
encryption. This ensures that data packets are unreadable to attackers who intercept them while moving across the network. Protocols such as TLS, HTTPS, IPsec, and SSH protect confidentiality and integrity of sensitive information.
B. Principle of least privilege (PoLP) secures access control but does not directly protect data in motion.
C. Role-based access control (RBAC) enforces permissions but again does not secure the data while transmitted.
D. Multifactor authentication (MFA) strengthens identity verification but does not directly protect the data itself once transmitted.
Thus, while all options contribute to overall security, encryption of data-in-transit most directly addresses protection of sensitive information on the network.
Reference (CompTIA Network+ N10-009):
Domain: Network Security ― Encryption methods, confidentiality, data-in-transit protection.