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Question 81

Which protocol is commonly used to securely authenticate users against a centralized directory service?

1. LDAP
2. Telnet
3. TFTP
4. ARP

Correct Answer: 1

Explanation

LDAP, or Lightweight Directory Access Protocol, provides a standardized method for accessing and managing directory information. Organizations commonly use LDAP-based directory services to store user accounts, groups, organizational information, and other identity data. Network applications can communicate with the directory to authenticate users or retrieve authorization-related information. Telnet provides remote terminal access, TFTP provides simple file transfers, and ARP resolves IPv4 addresses to MAC addresses. LDAP is therefore commonly associated with centralized directory-based identity and authentication systems.

Question 82

Which IPv4 subnet contains the address 192.168.10.65/26?

1. 192.168.10.0/26
2. 192.168.10.64/26
3. 192.168.10.128/26
4. 192.168.10.192/26

Correct Answer: 2

Explanation

A /26 subnet contains 64 total IPv4 addresses, creating subnet boundaries at 0, 64, 128, and 192 in the final octet. The address 192.168.10.65 falls between 64 and 127, so it belongs to the 192.168.10.64/26 subnet. The network address is .64 and the broadcast address is .127, leaving .65 through .126 as usable host addresses. Understanding subnet boundaries helps administrators determine whether two devices are on the same local network.

Question 83

Which protocol is used to automatically negotiate IP configuration parameters with a DHCP server?

1. DHCP
2. DNS
3. SNMP
4. NTP

Correct Answer: 1

Explanation

DHCP uses a standardized process to automatically provide clients with IP configuration information. A typical DHCP exchange includes Discover, Offer, Request, and Acknowledgment messages, commonly referred to as DORA. Through this process, a client can receive an IP address, subnet mask, default gateway, DNS server information, and other options. DNS handles name resolution, SNMP provides network management information, and NTP synchronizes clocks. DHCP is therefore the protocol responsible for automatically negotiating and assigning network configuration to clients.

Question 84

Which device commonly provides wireless connectivity to clients in an enterprise LAN?

1. Router
2. Access point
3. Patch panel
4. Media converter

Correct Answer: 2

Explanation

A wireless access point provides Wi-Fi connectivity to client devices and typically connects those wireless clients to a wired Ethernet network. Enterprise environments may deploy multiple access points to provide broader coverage and centralized wireless management. A router primarily connects different IP networks, while a patch panel provides a physical cable termination point. A media converter changes the physical transmission medium, such as copper to fiber. Therefore, the access point is the device specifically designed to provide wireless LAN connectivity.

Question 85

Which routing protocol is commonly used between autonomous systems on the internet?

1. OSPF
2. RIP
3. BGP
4. EIGRP

Correct Answer: 3

Explanation

Border Gateway Protocol, or BGP, is the primary routing protocol used to exchange routing information between autonomous systems. Internet service providers, large enterprises, and other organizations use BGP to advertise reachable networks and select routes based on configured policies and path attributes. OSPF and EIGRP are generally used within individual organizations or autonomous systems, while RIP is an older interior routing protocol. BGP is therefore essential for large-scale interdomain routing across the global internet.

Question 86

What is the main purpose of a default route?

1. To define a path for otherwise unmatched destinations
2. To assign IP addresses
3. To resolve hostnames
4. To block multicast traffic

Correct Answer: 1

Explanation

A default route provides a forwarding path for packets when no more specific route exists in the routing table. It is commonly represented in IPv4 as 0.0.0.0/0 and is often configured toward an upstream router or internet gateway. Without an appropriate default route, a device may know how to reach local networks but have no path for external destinations. Default routes are therefore especially important on routers, firewalls, and hosts that need to communicate beyond their directly connected networks.

Question 87

Which protocol is commonly used to obtain the IP address associated with a hostname?

1. ARP
2. DNS
3. NTP
4. SNMP

Correct Answer: 2

Explanation

DNS, or Domain Name System, translates human-readable hostnames into IP addresses. When a client needs to connect to a destination such as a web server, it can query a DNS resolver to determine the appropriate IP address. DNS supports different record types, including A records for IPv4 and AAAA records for IPv6. ARP performs local IPv4-to-MAC address resolution, NTP synchronizes time, and SNMP supports device monitoring. DNS is therefore the service responsible for hostname-to-IP resolution.

Question 88

Which wireless band generally offers the greatest number of channels and least legacy interference among common Wi-Fi bands?

1. 2.4 GHz
2. 5 GHz
3. 6 GHz
4. 900 MHz

Correct Answer: 3

Explanation

The 6 GHz Wi-Fi band provides a large amount of additional spectrum and is designed for newer Wi-Fi generations. It can offer many channels with less congestion from older Wi-Fi equipment because legacy devices generally cannot operate in the band. However, higher-frequency signals typically have shorter range and weaker penetration through obstacles than lower-frequency signals. The 2.4 GHz band offers greater range but more interference, while 5 GHz provides a balance between capacity and coverage. The 6 GHz band therefore offers substantial clean spectrum for compatible devices.

Question 89

Which protocol is commonly used to retrieve email while keeping messages synchronized on the server?

1. SMTP
2. IMAP
3. FTP
4. TFTP

Correct Answer: 2

Explanation

IMAP, or Internet Message Access Protocol, allows email clients to access and manage messages stored on a mail server. This makes it particularly useful when users access the same mailbox from multiple devices because message states such as read, unread, and folder organization can remain synchronized. SMTP is primarily used for sending and relaying email. FTP and TFTP are file-transfer protocols. IMAP is therefore the appropriate protocol when email should remain centrally stored and synchronized across multiple clients.

Question 90

Which network design places a firewall between an internal network and an untrusted external network?

1. Security perimeter
2. Loopback
3. Broadcast domain
4. Collision domain

Correct Answer: 1

Explanation

A security perimeter establishes a controlled boundary between trusted internal resources and an untrusted network, such as the public internet. Firewalls are commonly deployed at this boundary to inspect traffic and enforce security policies. They can control connections based on addresses, ports, protocols, applications, and other characteristics. A broadcast domain describes where Layer 2 broadcasts propagate, while a collision domain concerns Ethernet transmission behavior. Loopback refers to local host communication. A security perimeter is therefore the relevant concept for network boundary protection.

Question 91

Which Ethernet standard supports 1 Gbps over twisted-pair copper cabling?

1. 1000BASE-T
2. 100BASE-TX
3. 10BASE-T
4. 10GBASE-SR

Correct Answer: 1

Explanation

1000BASE-T is Gigabit Ethernet over twisted-pair copper cabling and supports speeds of up to 1 Gbps under appropriate conditions. It commonly operates over Cat 5e or better copper cabling for standard Ethernet distances. 100BASE-TX provides 100 Mbps, while 10BASE-T provides 10 Mbps. 10GBASE-SR supports 10 Gbps using multimode fiber rather than ordinary twisted-pair copper. Knowing Ethernet standards helps technicians select compatible cabling, transceivers, and network equipment.

Question 92

What is the purpose of a network access control system?

1. Compress network traffic
2. Control which devices or users can access network resources
3. Increase cable length
4. Resolve DNS queries

Correct Answer: 2

Explanation

Network Access Control, or NAC, helps organizations control access to network resources based on defined security requirements. NAC solutions can evaluate users, devices, authentication status, security posture, or other attributes before granting access. For example, an organization may require devices to be authenticated and meet certain security conditions before allowing access to internal systems. NAC does not primarily compress traffic, extend cable distance, or perform DNS resolution. Its primary role is enforcing controlled network access.

Question 93

Which command displays detailed network interface configuration on a Windows system?

1. nslookup
2. ipconfig /all
3. tracert
4. netstat

Correct Answer: 2

Explanation

The Windows command ipconfig /all displays detailed configuration information for network interfaces. Depending on the system, the output can include IPv4 and IPv6 addresses, subnet masks, default gateways, DNS servers, DHCP status, physical addresses, and other adapter information. nslookup focuses on DNS queries, tracert displays the path to a destination, and netstat displays network connections and related statistics. Ipconfig /all is therefore a useful first step when troubleshooting local IP configuration issues.

Question 94

Which technology is commonly used to provide centralized authentication for enterprise Wi-Fi?

1. WPA2-Enterprise
2. WEP
3. Open authentication
4. WPA-Personal only

Correct Answer: 1

Explanation

WPA2-Enterprise commonly uses 802.1X authentication with an external authentication server, such as a RADIUS server. This allows individual users or devices to authenticate using centrally managed credentials rather than sharing one wireless password. WEP is obsolete and insecure, while open authentication provides no meaningful access protection. WPA-Personal generally uses a shared pre-shared key instead of individual enterprise credentials. WPA2-Enterprise is therefore a common solution for centrally managed authentication in business wireless environments.

Question 95

Which network device regenerates and strengthens a signal to extend its transmission distance?

1. Repeater
2. Firewall
3. Router
4. Proxy

Correct Answer: 1

Explanation

A repeater receives a signal and regenerates it so that the signal can travel farther than it could on the original medium alone. Repeaters operate primarily at the physical layer and do not make routing or application-level forwarding decisions. Routers forward packets between networks, firewalls enforce security policies, and proxies act as intermediaries for application traffic. Although modern networks often use switches, access points, and other technologies instead of standalone repeaters, the repeater remains an important networking concept for signal extension.

Question 96

Which protocol is commonly used to securely access a remote network device’s command-line interface?

1. Telnet
2. SSH
3. HTTP
4. SNMP

Correct Answer: 2

Explanation

SSH provides encrypted remote command-line access to network devices and servers. It protects authentication credentials and administrative traffic from being transmitted in plain text, making it substantially safer than Telnet for remote management. Telnet sends communication without modern encryption, HTTP is primarily used for web-based services, and SNMP is mainly used for network monitoring and management. Network administrators commonly use SSH when they need secure command-line access to routers, switches, firewalls, servers, and other infrastructure.

Question 97

Which IPv4 address range is reserved for APIPA?

1. 172.16.0.0/12
2. 169.254.0.0/16
3. 192.168.0.0/16
4. 127.0.0.0/8

Correct Answer: 2

Explanation

Automatic Private IP Addressing, or APIPA, uses the 169.254.0.0/16 IPv4 range. A host may automatically select an address from this range when it is configured to use DHCP but cannot successfully obtain a DHCP lease. APIPA permits limited local communication but generally does not provide normal access to routed networks or the internet. The 172.16.0.0/12 and 192.168.0.0/16 ranges are private address spaces, while 127.0.0.0/8 is reserved for loopback operations.

Question 98

Which technology allows a network administrator to combine multiple physical links into one logical connection?

1. Link aggregation
2. Port mirroring
3. NAT
4. DHCP relay

Correct Answer: 1

Explanation

Link aggregation combines multiple physical network connections into a single logical connection between compatible devices. This can increase available bandwidth and provide redundancy if one physical link fails. Standards such as LACP can dynamically negotiate and manage aggregated links. Port mirroring copies traffic for analysis, NAT translates addresses, and DHCP relay forwards DHCP messages between network segments. Link aggregation is commonly used between switches, servers, storage systems, and other infrastructure where additional capacity and resiliency are required.

Question 99

Which protocol is used to securely resolve DNS queries using TLS?

1. DoH
2. DoT
3. FTP
4. SNMP

Correct Answer: 2

Explanation

DNS over TLS, or DoT, protects DNS queries by sending them through an encrypted TLS connection. This helps prevent unauthorized parties on the network from easily inspecting or modifying DNS requests in transit. DoH provides a similar privacy benefit but carries DNS queries over HTTPS instead. FTP is used for file transfer, while SNMP is designed for network monitoring and management. DoT is therefore the protocol specifically associated with encrypted DNS communication using TLS.

Question 100

Which protocol is commonly used to collect network device statistics for monitoring systems?

1. SNMP
2. SMTP
3. SFTP
4. SIP

Correct Answer: 1

Explanation

SNMP, or Simple Network Management Protocol, is widely used to monitor network devices and collect operational information. Monitoring systems can use SNMP to retrieve metrics such as interface utilization, packet errors, device uptime, memory usage, and other status information. SMTP is used for email transmission, SFTP provides secure file transfers, and SIP manages signaling for many voice and multimedia sessions. SNMP is therefore a fundamental protocol for centralized network monitoring and infrastructure visibility.