A network manager connects two switches together and uses two connecting links. Which of the following configurations will prevent Layer 2 loops?
A. 802.1Q tagging
B. Full duplex
C. Link aggregation
D. QoS
Show Answer
Correct Answer: C
Explanation: When two switches are connected by multiple physical links, a Layer 2 loop can form. Link aggregation (e.g., LACP/IEEE 802.3ad) bundles multiple links into a single logical link, so spanning tree sees only one path and no loop is created, while still allowing redundancy and increased bandwidth. The other options do not prevent Layer 2 loops.
Question 98
A major natural disaster strikes a company's headquarters, causing significant destruction and data loss. The company needs to quickly recover and resume operations. Which of the following will a network administrator need to do first?
A. Conduct a damage assessment.
B. Migrate to the cold site.
C. Notify customers of the disaster.
D. Establish a communication plan.
Show Answer
Correct Answer: A
Explanation: The first priority after a major disaster is to assess the damage to facilities, systems, and data. This assessment determines what is recoverable and guides subsequent actions such as activating a disaster recovery site, establishing communications, or notifying customers.
Question 99
Which of the following is the best device to use to provide security and filtering between a private network and a public network?
A. Switch
B. Firewall
C. Bridge
D. Gateway
Show Answer
Correct Answer: B
Explanation: A firewall is specifically designed to sit between a private network and a public network and enforce security policies by filtering traffic based on rules such as IP addresses, ports, protocols, and inspection methods. Switches and bridges only forward frames within networks, and a gateway mainly handles protocol translation rather than security filtering.
Question 100
Which of the following connector types is most commonly associated with Wi-Fi antennas?
A. BNC
B. SFP
C. MPO
D. RJ45
Show Answer
Correct Answer: A
Explanation: Wi‑Fi antennas use RF coaxial connections. Among the given options, BNC is an RF coaxial connector associated with antenna and radio-frequency applications. The other options are for optics (SFP, MPO) or Ethernet networking (RJ45), not antennas.
Question 101
Which of the following uses the longest prefix match to determine an exit interface?
A. ARP table
B. MAC address table
C. Routing table
D. Netstat table
Show Answer
Correct Answer: C
Explanation: Routers determine the outgoing (exit) interface by consulting the routing table. When multiple routes match a destination IP, the router applies the longest prefix match rule, selecting the most specific route (largest subnet mask). ARP maps IP-to-MAC, MAC tables forward frames by MAC on switches, and netstat only displays host connection information.
Question 102
Which of the following remote connectivity methods is used when data and management traffic use the same network infrastructure?
A. In-band
B. Native VLAN
C. Full-tunnel
D. Site-to-site
Show Answer
Correct Answer: A
Explanation: In-band management uses the same network infrastructure for both data traffic and management traffic. Management protocols (such as SSH or SNMP) traverse the same paths as user/application data, unlike out-of-band methods that use a separate network.
Question 103
Which of the following is the most cost-effective way for a network administrator to establish a persistent, secure connection between two facilities?
A. Site-to-site VPN
B. GRE tunnel
C. VXLAN
D. Dedicated line
Show Answer
Correct Answer: A
Explanation: A site-to-site VPN provides a persistent, encrypted connection over the public internet, delivering strong security at low cost. It is far cheaper than dedicated circuits while meeting the requirement for secure, continuous connectivity. GRE lacks native encryption, VXLAN targets data center L2 extension use cases, and dedicated lines are significantly more expensive.
Question 104
After a recent corporate merger, a network administrator needs to build reference documentation on multivendor infrastructure. Which of the following protocols will provide the information?
A. ICMP
B. CDP
C. LLDP
D. SIP
Show Answer
Correct Answer: C
Explanation: LLDP (Link Layer Discovery Protocol) is an IEEE 802.1AB vendor‑neutral protocol that allows network devices to advertise identity, capabilities, and neighbor information across multivendor environments. It is specifically designed for documenting and discovering mixed infrastructure, unlike CDP (Cisco‑only), ICMP, or SIP.
Question 105
A network technician is troubleshooting the connection to the company website. The traceroute command produces the following output:
Which of the following should the technician do to identify the path to the server?
A. Review the router's ACL.
B. Execute netstat.
C. Perform an nslookup.
D. Enable LDP.
Show Answer
Correct Answer: A
Explanation: Traceroute relies on ICMP Time Exceeded responses from intermediate routers. If only the first hop responds and subsequent hops show timeouts (*), ICMP may be filtered along the path. Reviewing the router’s access control lists can reveal whether ICMP is being blocked and help identify why the path to the server is not visible. The other options do not reveal routing paths.
Question 106
Which of the following is the best way to keep devices on during a loss of power?
A. UPS
B. Power load
C. PDU
D. Voltage
Show Answer
Correct Answer: A
Explanation: A UPS (Uninterruptible Power Supply) provides immediate battery-backed power when utility power is lost, keeping devices running without interruption. The other options do not supply backup power during outages.
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