A network administrator needs to securely connect to an Ubuntu server for management purposes. Which of the following protocols will most likely address this requirement?
A. HTTPS
B. SFTP
C. RDP
D. SSH
Show Answer
Correct Answer: D
Explanation: SSH (Secure Shell) is the standard protocol for securely administering Ubuntu/Linux servers over the network. It provides encrypted remote command-line access. HTTPS is for secure web access, SFTP is for secure file transfer (often over SSH) rather than interactive administration, and RDP is primarily used for remote desktop access, most commonly on Windows systems.
Question 162
Users in a company report that after walking from one room to another, wireless connectivity is lost. The SSID is available, but the users have to manually reconnect every time they change rooms. Which of the following is most likely the cause of this issue?
A. Each room has wireless interference.
B. There is poor wireless coverage.
C. MAC filtering is applied in the WLAN.
D. Roaming configuration is disabled.
Show Answer
Correct Answer: D
Explanation: The behavior described is characteristic of a roaming problem. As users move between access points, clients should seamlessly transition while remaining connected to the same SSID. If roaming is disabled or misconfigured, the client may disconnect when leaving one AP's coverage and require a manual reconnect to associate with the next AP. Interference or poor coverage would more likely cause weak or dropped connectivity rather than consistently requiring manual reconnection despite the SSID remaining visible, and MAC filtering would prevent unauthorized associations rather than specifically affect movement between rooms.
Question 163
A new backup system takes too long to copy files to the new SAN each night. A network administrator makes a simple change to the network and the devices to decrease backup times. Which of the following does the network administrator change?
A. QoS
B. SDN
C. MTU
D. VXLAN
E. TTL
Show Answer
Correct Answer: C
Explanation: Increasing the MTU (commonly enabling jumbo frames) reduces packet overhead and CPU processing during large file transfers, which is a common optimization for SAN and backup networks. QoS prioritizes traffic but does not inherently increase bulk transfer efficiency, SDN and VXLAN are unrelated to this simple throughput optimization, and TTL affects packet lifetime, not backup performance.
Question 164
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: Using two parallel links between switches creates the potential for Layer 2 loops. Link aggregation (such as LACP/IEEE 802.3ad) combines multiple physical links into a single logical link, allowing both links to be used while preventing Layer 2 loops because spanning tree treats the bundle as one logical connection. 802.1Q provides VLAN tagging, full duplex prevents collisions rather than loops, and QoS manages traffic priority.
Question 165
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 action after a disaster is to conduct a damage assessment to determine the extent of the impact on facilities, systems, and data. That assessment informs whether to activate a cold site and guides recovery priorities. Communication with customers and broader communication planning are important but follow activation of the appropriate disaster recovery process based on the assessment.
Question 166
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 provide security and traffic filtering between a trusted private network and an untrusted public network. Switches connect devices within a network, bridges connect network segments, and gateways translate or connect different network protocols but are not primarily security filtering devices.
Question 167
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: BNC is an RF coaxial connector historically associated with antenna and radio-frequency connections. Among the given options, it is the only RF antenna connector type; SFP is for fiber/network transceivers, MPO is a fiber-optic connector, and RJ45 is an Ethernet connector.
Question 168
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 use the routing table to perform longest prefix match (LPM) when forwarding packets. If multiple routes match the destination IP address, the route with the longest (most specific) network prefix is selected, which determines the exit interface. ARP tables map IP addresses to MAC addresses, MAC address tables are used by switches for Layer 2 forwarding, and netstat displays network connection information rather than making forwarding decisions.
Question 169
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 management traffic and regular data traffic. Out-of-band management, by contrast, uses a separate management network. The other options refer to VLAN behavior or VPN configurations rather than a management connectivity method.
Question 170
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 is the most cost-effective solution for creating a persistent, secure connection between two facilities. It uses the public internet with IPsec encryption to provide confidentiality and integrity at much lower cost than a dedicated leased line. GRE alone does not provide encryption, VXLAN is intended for Layer 2 network virtualization rather than secure site connectivity, and dedicated lines are secure and reliable but significantly more expensive.
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