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Question: 181. Which Aruba switch feature allows administrators to logically divide a physical switch into multiple broadcast domains?

1. LLDP
   2. Link aggregation
   3. VLANs
   4. Port mirroring

Correct Answer: 3

Explanation: VLANs allow a physical switch infrastructure to be logically divided into separate broadcast domains. Each VLAN represents a distinct Layer 2 broadcast domain, allowing administrators to separate users, devices, applications, or security zones while still using the same physical switching infrastructure. Communication between different VLANs requires Layer 3 routing. Port mirroring is used for traffic monitoring, link aggregation combines physical links, and LLDP exchanges information between neighboring devices. VLAN segmentation is therefore a fundamental method for organizing and controlling traffic within an enterprise switching environment.

Question: 182. What is the primary purpose of a trunk port on an Ethernet switch?

1. Carry traffic for multiple VLANs
   2. Disable broadcast traffic
   3. Assign IP addresses to clients
   4. Provide DNS services

Correct Answer: 1

Explanation: A trunk port is designed to carry traffic belonging to multiple VLANs across a single physical Ethernet connection. VLAN identification, commonly through IEEE 802.1Q tagging, allows the receiving device to determine which VLAN each frame belongs to. Trunk links are frequently used between switches, between switches and routers, or between switches and other VLAN-aware devices. A trunk does not automatically provide DNS or DHCP services, nor does it eliminate broadcast traffic. Proper trunk configuration is essential for maintaining VLAN connectivity across multiple network devices.

Question: 183. Which command-line concept is commonly used to verify the current configuration of a network switch?

1. Packet capture
   2. Configuration display
   3. Interface shutdown
   4. Cable testing

Correct Answer: 2

Explanation: A configuration display command allows an administrator to inspect the settings currently configured on a network device. Reviewing the configuration is useful when troubleshooting VLANs, interfaces, routing, security policies, and other services. It can also help verify whether a change was applied as intended. Packet capture analyzes traffic rather than configuration, interface shutdown disables an interface, and cable testing evaluates physical connectivity. Administrators should regularly verify device configurations to identify incorrect settings and confirm that operational behavior matches the intended network design.

Question: 184. Which metric is commonly used by routing protocols to determine the preferred path toward a destination?

1. MAC address
   2. Routing metric
   3. VLAN ID
   4. Interface description

Correct Answer: 2

Explanation: Routing protocols use metrics to compare available paths and determine which route should be preferred. The specific metric varies by routing protocol. Factors can include hop count, bandwidth, cost, delay, or a combination of attributes. A MAC address identifies a Layer 2 interface and does not normally determine an IP routing path. VLAN IDs identify Layer 2 segmentation, while interface descriptions are administrative labels. Understanding routing metrics helps administrators interpret why a particular route is selected and troubleshoot situations where traffic follows an unexpected path.

Question: 185. Which protocol is commonly used by network devices to automatically discover directly connected neighbors?

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

Correct Answer: 1

Explanation: Link Layer Discovery Protocol (LLDP) enables compatible network devices to advertise information about themselves to directly connected neighbors. This information can help administrators identify neighboring devices, ports, device capabilities, and physical connectivity. LLDP is particularly useful when documenting a network topology or troubleshooting an unexpected connection. DHCP is used for dynamic host configuration, NTP synchronizes clocks, and DNS provides name resolution. LLDP therefore provides a valuable Layer 2 discovery mechanism for understanding how network infrastructure devices are physically interconnected.

Question: 186. What is the purpose of a default route?

1. To assign VLAN numbers
   2. To authenticate switch users
   3. To identify every directly connected host
   4. To provide a path when no more specific route exists

Correct Answer: 4

Explanation: A default route provides a forwarding path for destinations that do not match a more specific route in the routing table. It is often used to send unknown or external traffic toward an upstream router or Internet connection. The default route acts as a fallback rather than replacing all other routing information. It does not assign VLAN numbers or authenticate users. A correctly configured default route can be particularly useful on edge devices and smaller networks where a single upstream path handles destinations outside the local routing table.

Question: 187. Which IPv4 address is within the private 192.168.0.0/16 address range?

1. 192.168.25.50
   2. 11.20.5.10
   3. 172.40.10.20
   4. 203.0.113.10

Correct Answer: 1

Explanation: The address 192.168.25.50 falls within the RFC 1918 private IPv4 range 192.168.0.0/16. Private addresses are commonly used inside local networks and are not directly routable across the public Internet. The 11.20.5.10 address is outside the private ranges, 172.40.10.20 is outside the private 172.16.0.0/12 range, and 203.0.113.10 belongs to a documentation range. Recognizing private address ranges is important when configuring enterprise networks, DHCP scopes, NAT, and internal routing.

Question: 188. What happens when an Ethernet switch receives a frame with an unknown destination MAC address?

1. It converts the frame into an IP packet
   2. It sends the frame only to the management port
   3. It immediately drops the frame
   4. It floods the frame within the applicable VLAN

Correct Answer: 4

Explanation: When a switch receives a frame whose destination MAC address is not present in its MAC address table, it normally floods the frame out eligible ports within the same VLAN, excluding the port on which the frame arrived. This allows the intended destination to receive the frame and gives the switch an opportunity to learn the destination MAC address when the device responds. The switch does not normally convert the Ethernet frame into an IP packet or send it only to a management port. Unknown-unicast flooding is therefore a normal Layer 2 switching behavior.

Question: 189. Which technology provides redundancy by allowing a standby gateway to assume forwarding responsibility if the active gateway fails?

1. DNS
   2. First-hop redundancy
   3. DHCP
   4. Port security

Correct Answer: 2

Explanation: First-hop redundancy technologies allow multiple Layer 3 devices to provide a resilient default-gateway service to hosts. One device can actively forward traffic while another remains available to take over if the active device becomes unavailable. This reduces the risk that a single gateway failure will disconnect an entire subnet from external networks. DHCP provides IP configuration, DNS resolves names, and port security controls access at the switch port. Gateway redundancy is particularly valuable in enterprise networks where continuous connectivity is required.

Question: 190. Which feature can restrict the number or identity of MAC addresses allowed on a switch port?

1. OSPF
   2. Port security
   3. NTP
   4. DNS

Correct Answer: 2

Explanation: Port security can be used to restrict which MAC addresses are permitted on a switch port or to limit the number of MAC addresses that can be learned. This can help prevent unauthorized devices from using a particular access port. Depending on the configuration, violations may trigger different protective actions. NTP provides time synchronization, OSPF is a dynamic routing protocol, and DNS performs name resolution. Port security should be configured carefully because legitimate devices such as phones, access points, or downstream switches may require more than one MAC address on a physical connection.

Question: 191. What is the primary purpose of an SVI on a Layer 3 switch?

1. Disable VLAN tagging
   2. Provide a Layer 3 interface associated with a VLAN
   3. Provide a physical cable connection
   4. Replace Ethernet frames with wireless frames

Correct Answer: 2

Explanation: A Switch Virtual Interface (SVI) is a logical Layer 3 interface associated with a VLAN. On a Layer 3 switch, an SVI can provide an IP gateway for devices in that VLAN and participate in routing between VLANs. Because it is virtual, an SVI does not require a separate physical interface for each VLAN. Physical switch ports provide the actual Ethernet connectivity, while VLAN tagging handles VLAN identification where appropriate. SVIs are therefore an important component of Layer 3 switching and inter-VLAN routing designs.

Question: 192. Which routing protocol is commonly classified as a link-state interior gateway protocol?

1. OSPF
   2. ARP
   3. FTP
   4. DHCP

Correct Answer: 1

Explanation: Open Shortest Path First (OSPF) is a link-state interior gateway protocol used to exchange routing information within an autonomous system. OSPF builds a topology database and uses the Shortest Path First algorithm to calculate routes. It supports hierarchical designs through areas and can scale across many enterprise networks. FTP is a file-transfer protocol, DHCP provides network configuration, and ARP resolves IPv4 addresses to MAC addresses. OSPF is therefore categorized as a dynamic link-state routing protocol rather than an application or address-resolution protocol.

Question: 193. What is the function of ARP in an IPv4 Ethernet network?

1. Encrypt Ethernet frames
   2. Synchronize network clocks
   3. Resolve an IPv4 address to a MAC address
   4. Assign an IPv4 address

Correct Answer: 3

Explanation: Address Resolution Protocol (ARP) maps an IPv4 address to the corresponding MAC address on a local Ethernet network. When a device needs to send an IPv4 packet to a local destination but does not know the destination MAC address, it can use ARP to discover it. The resulting information is normally stored temporarily in an ARP cache. ARP does not assign IP addresses, encrypt frames, or synchronize clocks. Understanding ARP is useful when troubleshooting local connectivity and examining how IPv4 packets are encapsulated into Ethernet frames.

Question: 194. Which action can help reduce unnecessary broadcast traffic within a switched network?

1. Creating appropriate VLAN boundaries
   2. Increasing every port’s speed
   3. Disabling all routing
   4. Removing MAC addresses

Correct Answer: 1

Explanation: VLAN boundaries divide a switched network into separate Layer 2 broadcast domains. Broadcast frames generated within one VLAN normally remain within that VLAN rather than being propagated throughout the entire switching environment. Appropriate segmentation can therefore limit the scope of broadcast traffic and improve network organization. Increasing port speed does not change the broadcast domain, disabling routing can reduce connectivity rather than broadcasts, and removing MAC addresses would not provide a proper broadcast-control mechanism. VLAN design should reflect functional, security, and operational requirements.

Question: 195. What is the purpose of DHCP lease duration?

1. Define the Ethernet frame size
   2. Determine how long a client may use an assigned address before renewal
   3. Select an OSPF path
   4. Determine the switch’s MAC address

Correct Answer: 2

Explanation: A DHCP lease duration determines how long a client can use an address assigned by the DHCP server before it needs to renew the lease. Lease management allows address pools to be reused when clients leave the network and helps administrators control address allocation. The renewal process normally occurs before the lease expires so that active clients can continue using their configuration. Lease duration does not determine Ethernet frame size, routing-protocol path selection, or a switch’s MAC address. Proper lease settings can help balance address utilization and administrative requirements.

Question: 196. Which type of Ethernet cable is commonly used to connect a network switch to an end-user computer?

1. Straight-through twisted-pair Ethernet cable
   2. Console-only cable
   3. Serial WAN cable
   4. Fiber patch cable exclusively

Correct Answer: 1

Explanation: A standard twisted-pair Ethernet patch cable is commonly used to connect an end-user computer to a switch access port. Modern Ethernet interfaces often support automatic MDI/MDIX, allowing compatible devices to determine the appropriate transmit and receive pairing automatically. The exact cable category depends on required speed, distance, and installation conditions. Console cables are intended for device management, serial WAN cables serve different legacy connectivity purposes, and fiber is used where optical connectivity is required. Physical-layer compatibility should always be verified when selecting cabling for a network installation.

Question: 197. Which command output would be most useful for checking whether a switch interface is operational?

1. User password history
   2. Interface status information
   3. DNS zone information
   4. DHCP lease database only

Correct Answer: 2

Explanation: Interface status information can show whether a switch port is physically and logically operational. Depending on the platform, the output may include link state, administrative state, speed, duplex, VLAN assignment, errors, and other useful operational details. This information is often one of the first places an administrator checks when troubleshooting connectivity. DNS information and DHCP databases provide different types of information, while password history is unrelated to interface operation. Checking interface status can quickly identify conditions such as a disabled port or loss of physical link.

Question: 198. What is the primary advantage of using a centralized authentication server such as RADIUS?

1. It centralizes authentication and authorization information
   2. It increases Ethernet cable length
   3. It replaces all network switches
   4. It eliminates the need for IP addresses

Correct Answer: 1

Explanation: RADIUS can centralize authentication and authorization for network-access services. Instead of maintaining separate user credentials independently on every network device, an organization can use a centralized authentication infrastructure to apply consistent access policies. RADIUS is commonly associated with technologies such as 802.1X and can also support administrative access depending on the network design. It does not replace physical switches, eliminate IP addressing, or increase cable length. Centralized authentication can simplify account management and make it easier to enforce consistent access-control policies across multiple network devices.

Question: 199. Which security principle gives users only the permissions required to perform their assigned tasks?

1. Route summarization
   2. Load balancing
   3. Least privilege
   4. Broadcast forwarding

Correct Answer: 3

Explanation: The principle of least privilege means users, devices, or applications should receive only the permissions necessary to perform their authorized functions. Limiting privileges can reduce the potential impact of compromised credentials or accidental misuse. In network environments, this principle can be applied through role-based administration, access-control policies, and appropriate authorization levels. Broadcast forwarding and route summarization are networking functions, while load balancing distributes traffic across resources. Least privilege is therefore primarily a security and access-management principle rather than a traffic-forwarding technology.

Question: 200. Which practice is most useful before making a significant configuration change on a production switch?

1. Document or back up the existing configuration
   2. Disable every interface
   3. Delete the current configuration
   4. Change all VLAN IDs randomly

Correct Answer: 1

Explanation: Documenting or backing up the existing configuration before making a significant change provides a recovery reference if the change causes an unexpected problem. It also allows administrators to compare the previous and modified configurations during troubleshooting. A reliable change process may include reviewing the intended change, recording the current state, performing the modification during an appropriate maintenance period, and validating the result. Disabling interfaces, deleting configurations, or randomly changing VLAN IDs can create unnecessary outages. Configuration backups are therefore an important part of responsible network administration.