A network administrator is implementing dynamic routing protocols for a large enterprise network that has several vendor devices. Which of the following is the best choice for an enterprise network with multiple locations and high-bandwidth requirements?
A. IS-IS
B. OSPF
C. BGP
D. RIP
Show Answer
Correct Answer: B
Explanation: OSPF is the standard interior gateway protocol for large enterprise networks with multiple locations and multivendor equipment. It is a link-state protocol that scales well, converges quickly, and is widely supported across vendors. BGP is primarily used for interdomain routing between autonomous systems, RIP does not scale well, and IS-IS is capable but is more commonly associated with service provider environments than typical enterprise deployments.
Sources:
https://www.grandmetric.com/routing-information-protocol-explained
Question 82
A systems administrator is resolving connectivity issues to an organization’s DNS server. While troubleshooting, the administrator performs remote scans ana receives the following output:
Which or the following should the systems administrator investigate?
A. URL filters
B. Unused services
C. Firewall rules
D. 802.1X on the switch
Show Answer
Correct Answer: C
Explanation: If a DNS server is experiencing connectivity issues and remote port scan output indicates unexpected reachability or blocked access, the primary area to investigate is firewall rules controlling DNS traffic (typically TCP/UDP port 53). Open unused services are a security concern but do not directly explain DNS connectivity problems. URL filters and 802.1X switch authentication are not the most likely causes in this scenario.
Question 83
A network technician needs to configure IP addressing in a Class С network with eight subnets total:
• Three for 60 hosts
• Three for 15 hosts
• Two for seven hosts
Which of the following solutions should the technician use to accomplish this task?
A. CIDR
B. APIPA
C. VLSM
D. RFC 1918
Show Answer
Correct Answer: C
Explanation: VLSM (Variable Length Subnet Masking) is required because the network must support multiple subnets with different host capacities (60, 15, and 7 hosts). VLSM allows different subnet masks within the same address block, making efficient use of the available Class C address space. CIDR is primarily for route aggregation and classless allocation, APIPA is for automatic link-local addressing, and RFC 1918 defines private IP address ranges rather than subnetting methods.
Question 84
A company recently experienced outages of one of its critical, customer-facing applications. The root cause was an overutilized network router, but the Chief Technology Officer is concerned that the support staff was unaware of the issue until notified by customers. Which of the following is the best way to address this issue in the future?
A. Packet capture
B. SNMP
C. Syslog collector
D. SIEM
Show Answer
Correct Answer: B
Explanation: SNMP enables proactive monitoring of network devices such as routers by collecting performance metrics and generating alerts when utilization exceeds thresholds. This allows support staff to detect and respond to issues before customers report outages. Packet captures are for troubleshooting, syslog collectors aggregate log messages but do not provide comprehensive performance monitoring, and SIEMs correlate security and event data rather than serving as the primary network performance monitoring solution.
Question 85
Which of the following cables is the most appropriate to use when running bulk cables in ceilings?
A. Plenum
B. Coaxial
C. Ethernet
D. DAC
Show Answer
Correct Answer: A
Explanation: Plenum-rated cable is designed for installation in plenum spaces such as many ceiling air-handling areas. Its jacket is made to meet stricter fire-resistance and low-smoke requirements, making it the appropriate choice for running bulk cables in ceilings. Coaxial and Ethernet describe cable types rather than plenum fire ratings, and DAC is for direct-attach connections between network devices.
Question 86
A network administrator installs a wireless AP to an existing PoE switch on G1/0/1. The administrator notices that the new wireless AP is not receiving any power. The administrator logs in to the switch and views the following power statistics:
Which of the following is the most likely reason the wireless AP is not receiving power?
A. The switch is not configured to provide power over the connected port.
B. The wireless AP’s power cable is damaged.
C. The wireless AP is not receiving power due to overutilization.
D. The switch’s firmware needs to be updated.
Show Answer
Correct Answer: A
Explanation: The most likely cause is that the switch is not providing PoE on the connected port. If the power statistics indicate the port is not delivering power (or the port is administratively down/not configured for PoE), the AP will not receive power. A damaged AP power cable is irrelevant for PoE, overutilization would typically be indicated by exhausted PoE budget, and a firmware update is not the most likely explanation.
Question 87
A network administrator is extending a network beyond the primary equipment location. Which of the following is where the administrator should install additional network switches?
A. MDF
B. VPC
C. VXLAN
D. IDF
Show Answer
Correct Answer: D
Explanation: An Intermediate Distribution Frame (IDF) is used to house access-layer switches and extend network connectivity to areas beyond the Main Distribution Frame (MDF). The MDF is the primary equipment room, while VPC and VXLAN are networking technologies, not physical locations for installing additional switches.
Question 88
A network administrator deploys new network hardware. While configuring the network monitoring server, the server could authenticate but could not determine the specific status of the hardware. Which of the following would the administrator most likely do to resolve the issue?
A. Use the public community string.
B. Import the appropriate MI
C. Set up a switch port analyzer and forward traffic.
D. Configure SNMPv3 privacy.
Show Answer
Correct Answer: B
Explanation: If SNMP authentication succeeds but the monitoring server cannot interpret or display detailed hardware status, the server is likely missing the device's Management Information Base (MIB) definitions. Importing the appropriate MIB allows the monitoring software to map vendor-specific OIDs to meaningful hardware status information. The other options do not address the inability to interpret SNMP data after successful authentication.
Question 89
A network engineer receives a new router to use for WAN connectivity. Which of the following best describes the layer the network engineer should connect the new router to?
A. Core
B. Leaf
C. Spine
D. Access
Show Answer
Correct Answer: A
Explanation: A WAN edge router that provides external connectivity is typically connected at the core layer in a traditional three-tier enterprise network. The access layer connects end devices, while spine and leaf are components of a data center fabric rather than the enterprise campus hierarchy. Although the spine plays a role similar to a core within a leaf-spine fabric, WAN edge connectivity in this context is described using the traditional core layer.
Question 90
Three access points have Ethernet that runs through the ceiling. One of the access points cannot reach the internet. Which of the following tools can help identify the issue?
A. Network tap
B. Cable tester
C. Visual fault locator
D. Toner and probe
Show Answer
Correct Answer: B
Explanation: A cable tester verifies the integrity and correct pinout of an Ethernet cable, helping identify opens, shorts, miswires, or other physical cabling faults that could prevent the access point from connecting. A network tap is for traffic monitoring, a visual fault locator is for fiber optics, and a toner and probe is primarily for tracing and identifying cable runs rather than validating cable functionality.
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