Network Implementation

A network technician configures an 802.1Q trunk link between two switches. After the configuration, VLAN 20 traffic is not passing across the trunk, although VLAN 10 traffic works fine. The technician verifies that both switches have VLAN 20 created and that the trunk is up. What is the most likely cause?

A company is deploying a wireless network that must support both 2.4 GHz and 5 GHz frequency bands. Which IEEE 802.11 standard supports both bands and is backward compatible with older devices?

A network administrator connects two switches with a trunk link that is configured to allow all VLANs. Workstations in VLAN 10 can communicate across the switches, but workstations in VLAN 20 cannot. Both VLANs are configured on the first switch. What is the most likely cause of the issue?

A network architect is designing a Software-Defined Networking (SDN) based network. Which of the following components is responsible for making centralized forwarding decisions and communicating those decisions to the physical switches using southbound APIs?

A network administrator adds a new server to VLAN 20. The switch port is configured as an access port in VLAN 20, and the server has a correct static IP address in that subnet. However, the server cannot communicate with other devices in the same VLAN. The VLAN exists on the switch and other devices in VLAN 20 are working. What is the most likely cause of this issue?

A network administrator needs to connect two buildings 2 km apart using single-mode fiber. Which transceiver type should be used?

A network administrator has just connected a new access switch to the core switch via a trunk port. The administrator configured the trunk port on both switches with the same allowed VLAN list. However, hosts on VLAN 10 connected to the new access switch cannot communicate with hosts on VLAN 10 on the core switch. The trunk is operational and shows up/up. What is the most likely cause?

A network engineer needs to segment a single physical switch into multiple broadcast domains to improve security and reduce traffic. Which technology should be implemented?

A company is deploying VoIP phones and wants to ensure voice packets receive priority over data packets on the network. Which technology should be implemented on the switches and routers?

An organization uses OSPF as its interior gateway protocol in a multi-area design. After a core router failure, the network takes several seconds to reconverge. Which technology can be implemented to improve convergence speed?

A network administrator is configuring OSPF on a router that has interfaces in only one area and does not perform route redistribution. Which OSPF router type best describes this router?

A network administrator is creating a new VLAN that will contain 20 devices. The administrator wants to use the most efficient subnet that provides enough usable IP addresses while minimizing waste. Which of the following subnet masks should be used?

A company wants to deploy a wireless network in an office with high-density client requirements. Which 802.11 technology allows multiple antennas to transmit multiple spatial streams to increase throughput?

A network engineer is configuring a router to provide IPv6 addressing via SLAAC for hosts on a subnet. The ISP has delegated a prefix 2001:db8:1::/48 and requires the router to advertise a specific prefix 2001:db8:1:1::/64. Which command must be configured on the router's interface to advertise this prefix?

A company is implementing a DMZ to host public-facing web and email servers. The DMZ network uses private IP addresses, and the internal network also uses private IP addresses. The company has only one public IP address assigned to the border router's external interface. Which of the following should be configured to allow internet users to access the DMZ servers?

A network administrator is implementing a new wireless network that will use WPA2-Enterprise. Which of the following must be configured on the network to support this security method?

A network engineer is installing a WLAN in a warehouse with many metal shelves and racks. During a site survey, the engineer notices significant signal degradation in certain areas. Which wireless propagation phenomenon is most likely causing the issue?

A router receives a packet destined for 10.0.0.15. It has the following routes in the routing table: 10.0.0.0/8 via 192.168.1.1, 10.0.0.0/16 via 192.168.2.1, 0.0.0.0/0 via 192.168.3.1. Which route will be used?

A network administrator is connecting two switches and wants to increase the bandwidth between them while also providing redundancy in case one link fails. Which technology should be configured on the switch ports?

A network administrator is configuring a trunk link between two switches. The link is up, but devices on VLAN 30 cannot communicate across the trunk. Devices on VLAN 10 and 20 can communicate. What should the administrator verify?

A network administrator is configuring a router-on-a-stick to route between two VLANs (VLAN 10 and VLAN 20). The router has two subinterfaces: GigabitEthernet0/1.10 with encapsulation dot1Q 10 and IP 10.10.10.1/24, and GigabitEthernet0/1.20 with encapsulation dot1Q 20 and IP 10.10.20.1/24. The switch port connected to the router is configured as an access port in VLAN 10. Hosts in VLAN 10 can ping the router's VLAN 10 interface, but hosts in VLAN 20 cannot ping the router's VLAN 20 interface. What is the most likely cause?

A network administrator wants to allow wireless clients to seamlessly roam between access points without re-authenticating to the RADIUS server for each transition. Which IEEE standard should be implemented?

A network engineer needs to connect two buildings that are 200 meters apart with a 1 Gbps link. The path is outdoors and susceptible to lightning strikes. Which cable type is the most appropriate for this scenario?

A technician installs a new wireless access point that requires 25 watts of power using Power over Ethernet (PoE). The existing switch only supports 802.3af (15.4W per port). What is the most likely result?

A company is deploying a wireless network in an office where employees move between floors. They want clients to authenticate once and maintain connectivity without re-authenticating when roaming between access points (APs). Which IEEE wireless standard provides this fast roaming capability?

A company is implementing a wireless network and needs to support high-density client environments with minimal interference. Which IEEE 802.11 standard operates in the 5 GHz band and provides the highest throughput among the options?

An organization uses OSPF as its interior gateway protocol in a multi-area design. After a core router failure, the network takes a long time to reconverge. Which technology can be implemented to improve convergence speed?

A network administrator needs to connect two switches located in separate buildings 150 meters apart. The connection must support 10 Gbps speeds. Which cabling type is most appropriate?

A network administrator is connecting two switches to increase bandwidth and provide redundancy. Which technology should be used to combine multiple physical links into a single logical link?

A network administrator needs to upgrade the backbone link between two switches to fiber optic to eliminate electromagnetic interference. The distance between the switches is 350 meters. Which transceiver type should be used?

A network engineer needs to connect two devices that are 150 meters apart with a 10 Gbps link. Which cabling type is most suitable?

A network engineer is configuring a new wireless LAN for a high-density environment such as a conference hall. The engineer needs to minimize co-channel interference. Which of the following should be configured on the access points?

A company wants to increase the bandwidth between two switches without upgrading the existing 1 Gbps copper links. Both switches support 802.3ad. Which technology should be implemented?

A network administrator is designing a Layer 2 network with redundant links between switches. Which protocol should be implemented to prevent loops in the network?

A network administrator is configuring a trunk link between a switch and a router to support multiple VLANs. The switch's trunk port is set to dot1q encapsulation. Which configuration must match on the router to ensure proper communication?

A network administrator is configuring a new WAN link between two offices using MPLS. Which of the following is a characteristic of MPLS?

A company is extending its network to a new building located 200 meters away. The link must support 1 Gbps speeds. Which cabling type should be used?

A network engineer configures an 802.1Q trunk between two switches. The trunk is up, but VLAN 10 traffic is not passing. The engineer checks and confirms that VLAN 10 exists on both switches. The show interfaces trunk command displays 'allowed VLANs: none'. What is the most likely cause?

A company is deploying a new wireless network in a warehouse. The network administrator needs to ensure that clients can seamlessly roam between access points without losing connectivity. Which of the following should be configured?

A network engineer is planning a wireless LAN for an open office with 50 users. To maximize performance by using multiple non-overlapping channels, which frequency band should be primarily used?

A network engineer needs to implement a wireless network in a large open-plan office with high client density. The network must provide the fastest possible speeds and efficient handling of many simultaneous connections. Which IEEE 802.11 standard should be used?

A network administrator is configuring OSPF on routers in a multi-area network. The administrator wants to ensure that a router in area 1 does not learn external routes (Type 5 LSAs) injected by an ASBR in area 0, but it must still learn inter-area routes (Type 3 LSAs). The administrator wants to reduce the routing table size. Which OSPF area type should be configured for area 1?

A network administrator is configuring a new switch to carry traffic for multiple VLANs on a single link to a router. Which IEEE standard is used for VLAN tagging on Ethernet trunks?

A network administrator is deploying a wireless network in a warehouse environment with many metal racks. Clients using 802.11ac report strong signal strength but very low throughput. What is the most likely cause?

A company is connecting two buildings that are 300 meters apart. The link must support 10 Gbps. Which combination of cable and transceiver should be used?

A network engineer needs to install 15 wireless access points that each require 25W of power. The available switch provides PoE+ (802.3at) with a total power budget of 740W. The engineer also needs to connect 10 IP cameras that each require 12W. Which of the following should the engineer verify before proceeding with the installation?

A company is deploying a new wireless network for employee devices and wants to use the most secure encryption method currently available for WPA2/3. Which encryption standard should be used?

A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?

A small office uses a wireless router that provides both wired and wireless connectivity. The router's LAN IP is 192.168.1.1. A new printer with a static IP of 192.168.1.50 cannot be reached from a laptop obtaining an IP via DHCP. The laptop's IP is 192.168.1.100. Which of the following is the most likely cause?

Match each OSI layer to its description.

Two switches are connected via a trunk link configured with allowed VLANs 10, 20, and 30. Hosts on VLAN 20 can communicate across the trunk, but hosts on VLAN 30 cannot. Which of the following is the most likely cause?

A company is deploying a new wireless network for a small office. The network will consist of three access points. The IT manager wants the APs to automatically coordinate radio frequency settings and client roaming without a dedicated controller. Which technology should be implemented?

A network engineer has established an IPsec VPN tunnel between a branch office (10.0.0.0/24) and the main office (192.168.10.0/24). The tunnel shows as up and active, but users at the branch office cannot ping the main office server at 192.168.10.10. The main office can ping the branch office gateway successfully. What is the most likely cause of this issue?

An OSPF network uses a multi-access segment with four routers. All router interfaces have the default OSPF priority of 1. Which router becomes the Designated Router (DR)?

A network administrator needs to connect two switches that are 80 meters apart using UTP cabling and achieve 1 Gbps speed. The administrator has Cat5e and Cat6 cables available. Which standard should be used?

A company has deployed a WPA2-Enterprise wireless network. Users report that they cannot authenticate. The RADIUS server logs show that authentication attempts are received but no responses are sent back to the wireless controller. The wireless controller and RADIUS server are on different subnets, separated by a firewall. Which of the following is the MOST likely cause?

A switch port is configured as a trunk with native VLAN 99. When a frame tagged with VLAN 99 is received on the trunk, the switch displays an error. What is the most likely issue?

A network engineer needs to add a new switch to an existing network. The switch must be configured to support VLANs and trunking. The engineer connects the switch to the existing network via a trunk port. After configuration, the VLANs on the new switch are not receiving traffic from the core network. The core switch shows the trunk is up but no VLANs are allowed. What is the most likely cause?

A small office has multiple devices that need internet access but the ISP provides only a single public IPv4 address. Which network address translation (NAT) technique is most appropriate to allow all internal hosts to share that one public address?

A network administrator is setting up a new branch office that will connect to the main headquarters over the Internet. The connection must be encrypted and allow the branch to access internal resources as if they were directly connected. Which of the following VPN types is BEST suited for this site-to-site connection?

A network engineer needs to deploy a new wireless network in a large office with many cubicles. The goal is to provide high throughput and support multiple simultaneous users. Which IEEE standard should be implemented?

A network technician installs a new 802.3at (PoE+) access point in a warehouse. The AP is connected via a 200-foot Cat5e cable to a switch that only supports 802.3af (PoE). The AP powers on but experiences intermittent connectivity drops. What is the most likely cause?

Match each network service to its description.

A company is implementing a new wireless network for employees. The network must support seamless roaming between access points. Which protocol should be configured on the wireless controller?

A network technician is installing a new wireless access point in a warehouse. The AP requires PoE+ (802.3at) for full operation. The technician connects the AP using a Cat5e cable run of 200 feet to a switch that only supports 802.3af (PoE). The AP powers on but has intermittent connectivity issues. What is the most likely cause?

A network engineer is designing a data center network and needs to ensure high availability for the core switches. Which technology allows multiple physical switches to be combined into a single logical switch to simplify management and improve redundancy?

A network engineer is designing an OSPF network for a large enterprise. To reduce the size of routing tables and limit the propagation of external routes, the engineer wants to use a special area that blocks Type 5 LSAs but still allows inter-area routes via a default route. Which type of OSPF area should be configured?

A company wants to deploy a wireless network for employee devices using the highest security standard. The network will use a RADIUS server for authentication. Which authentication method should be configured?

A network administrator needs to allow multiple VLANs to traverse a single link between two switches. Which configuration must be applied on the switch ports?

A network engineer has successfully established an IPsec site-to-site VPN tunnel between a branch office (10.0.1.0/24) and the main office (192.168.1.0/24). The tunnel status shows as active, and both sides can ping each other's tunnel interface IP addresses. However, users at the branch office cannot ping the main office server at 192.168.1.10, and the main office cannot ping the branch office server at 10.0.1.10. The firewall rules on both sides permit IPsec traffic and all internal traffic. What should the engineer check NEXT?

A network administrator is creating a new VLAN 50 on a switch. After creating the VLAN, the administrator notices that the switch does not send VLAN information to other switches in the network. Which of the following is the most likely reason?

A network architect is implementing a Software-Defined Networking (SDN) solution. The SDN controller needs to communicate with the physical switches to install flow rules. Which type of API is used for this communication?

A company is setting up a new branch office and needs to connect it to the main office over the internet using a secure VPN. The branch office has a dynamic public IP address. Which type of VPN should be configured?

A new switch is installed in a remote wiring closet. It has been configured with a management IP address of 10.1.2.50/24. The switch is connected via a trunk to the distribution switch, and the management station (10.1.1.0/24) is on a different subnet. The switch cannot be pinged from the management station. The distribution switch has routing to the 10.1.2.0/24 subnet. What is the most likely cause?

An organization needs to connect two buildings that are 2 km apart with a point-to-point wireless link. Which antenna type is BEST suited for this long-distance directional connection?

A network engineer is designing a wireless network for a large warehouse with many metal racks and heavy machinery that cause significant RF interference. The network must support a high density of IoT sensors and provide reliable connectivity. Which IEEE wireless standard should the engineer implement to best meet these requirements?

A network administrator needs to connect two switches to allow multiple VLANs to traverse the link. Which protocol should be used to tag frames with VLAN information?

A network engineer is planning to connect two switches that are 150 meters apart. The link must support at least 1 Gbps and the budget is limited. Which cable type should be used?

A network engineer is deploying a wireless network using 802.11ac. To allow clients to roam between access points without re-authenticating to the authentication server, which IEEE standard should be implemented?

A network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?

A network engineer is designing a subnet for a department that requires exactly 50 usable host addresses. Which subnet mask provides the minimum number of usable host addresses while still accommodating the requirement?

A company has just installed a new fiber optic connection between two buildings 2 km apart. The connection is using multimode fiber. However, the signal is too weak at the receiving end. What is the most likely cause?

A network engineer has configured an IPsec site-to-site VPN between two offices. The tunnel is established and shows as active. However, users at the branch office (10.0.1.0/24) cannot reach servers at the main office (192.168.1.0/24). Both routers have the correct VPN policies and firewall rules permitting IPsec traffic. What should the engineer check next?

A network administrator is configuring a new switch for management access via SSH. Which step must be performed FIRST?

A network engineer needs to connect two switches that are located 450 meters apart. Which combination of fiber optic transceiver and cable type would support the highest data rate over this distance?

Drag and drop the steps in the DHCP lease process (DORA) into the correct order.

A network engineer is implementing OSPF on a router. All directly connected neighbors are listed with state FULL, but routes from another area are not appearing in the routing table. Which of the following is the most likely cause?

A network administrator is configuring dynamic routing between two routers in the same organization. The routers must support VLSM, converge quickly, and use a metric that is based on bandwidth and delay. Which routing protocol should be configured?

An organization wants to deploy Wi-Fi in a large, open office space. They need high throughput and the ability to support many simultaneous clients, but they are budget-constrained. Which IEEE wireless standard should they choose?

A network administrator needs to power IP phones and wireless access points through the Ethernet cable. Which standard should be supported?

Drag and drop the steps for the TCP three-way handshake into the correct order.

A network engineer is configuring a new wireless deployment in a warehouse with hundreds of metal racks. Users report intermittent connectivity and slow throughput when walking between aisles. The engineer decides to perform a site survey and adjust the wireless design. Which of the following should the engineer implement to improve coverage and reduce interference in this environment?

A network engineer is configuring a trunk link between two switches to carry VLANs 10, 20, and 30. On Switch A, the port is configured with 'switchport mode trunk' and 'switchport nonegotiate'. On Switch B, the port is left at the default configuration. Which additional configuration is required on Switch B?

A network engineer is configuring a Link Aggregation Group (LAG) between two switches. Switch A is set to LACP active mode. Which mode should be configured on Switch B to form the LAG?

A network administrator is configuring a new switch in a production environment. The switch must be managed remotely. Which of the following should be configured on the switch's management interface?

A network administrator is installing cable in a plenum space (an area used for air circulation, such as above a drop ceiling). Which cable type is required by most building codes for such an installation?

A network administrator is configuring Quality of Service (QoS) on a router to prioritize voice traffic. Which of the following fields should be used to mark packets for classification and prioritization?

A network technician needs to connect two switches to support multiple VLANs between them. The technician wants to use a single link to carry traffic for all VLANs. Which protocol should be used to tag frames with VLAN information?