All practice questions

A network administrator upgrades several core backbone links within an Open Shortest Path First (OSPF) routing domain from 1 Gbps to 10 Gbps. Despite the physical bandwidth upgrade, the core routers assign an identical metric cost of 1 to both the 1 Gbps and 10 Gbps interfaces, resulting in unwanted equal-cost multi-path (ECMP) load balancing across asymmetric links. Which configuration change must be applied to ensure OSPF correctly assigns a lower metric cost to the 10 Gbps interfaces?

A client workstation on VLAN 20 ($192.168.20.0/24$) broadcasts a DHCPDISCOVER message to obtain an IP configuration. The Layer 3 switch interface acting as the default gateway for VLAN 20 is configured with an IP helper address pointing to a centralized DHCP server at $10.0.99.5$ on VLAN 99. Which of the following operations accurately describe how the relay agent processes and forwards this message? (Select TWO.)

An enterprise network engineer is deploying redundant centralized DHCP servers ($192.168.100.10$ and $192.168.100.11$) located in a dedicated management subnet. Workstations are partitioned across three client subnets (VLAN 20: $10.20.0.0/24$, VLAN 30: $10.30.0.0/24$, and VLAN 40: $10.40.0.0/24$) terminated on a Layer 3 core switch serving as their default gateway. Which TWO of the following statements correctly describe the technical mechanics and configuration requirements for the Layer 3 switch when relaying DHCPDISCOVER broadcast requests to the server pool?

A network administrator is configuring dynamic IP addressing and name resolution services across an enterprise network. The organization requires client hostnames to be automatically registered in the internal DNS zone whenever a host receives an IPv4 address lease from the centralized DHCP server. Which TWO of the following steps must be configured to enable dynamic DNS (DDNS) updates between the DHCP and DNS servers?

A network engineer is analyzing traffic traversing an enterprise Layer 3 switch configured for inter-VLAN routing. A client host on VLAN 10 sends a request to a destination server on VLAN 20. When the switch receives the frame on its VLAN 10 interface and routes it out through the VLAN 20 interface, which of the following best describes the de-encapsulation and re-encapsulation process performed by the switch?

During data transmission across an IEEE 802.1Q trunk link, a switch inserts a 4-byte header tag into Ethernet frames for non-native VLANs. At which specific location within the standard Ethernet II frame header is this 802.1Q tag inserted?

A network administrator is configuring a point-to-point interconnect between two core routers. The interface on Router A is assigned the IPv4 address $10.200.15.14/30$. What is the directed broadcast address for this subnet?

Match each network documentation type to its primary operational use case.

An enterprise branch office has 500 internal workstations configured on a private IPv4 network ($10.1.0.0/22$). Outbound internet access is currently handled by an edge router using Port Address Translation (PAT / NAT Overload) mapped to a single public IP address ($203.0.113.5$). During peak operational hours, users report that while existing web sessions remain active, new outbound connection attempts to cloud services begin timing out consistently. A network administrator inspects the router's active translation table and discovers over $64,000$ active translation entries associated with $203.0.113.5$, while CPU, memory, and interface bandwidth utilization on the edge router remain below $25\%$. Which of the following implementation changes is the most appropriate solution to resolve the connection failures?

A network architect is evaluating an existing industrial facility deployment that uses a hybrid physical star, logical bus network topology. Which of the following statements accurately describe the structural and operational characteristics of this hybrid network layout? (Select TWO.)

A network engineer is configuring a Layer 3 switch to relay DHCP requests from client workstations on VLAN 35 ($172.16.35.0/24$) to two redundant central DHCP servers located on VLAN 100 ($10.100.0.10$ and $10.100.0.11$). Which of the following statements correctly describe the behavior and operational mechanics of the DHCP relay agent when processing these client requests? (Select TWO options.)

A systems deployment team is provisioning a dedicated IPv4 subnet for a smart office floor. The design plan requires static IP assignments for $42$ IoT sensors, $4$ wireless access points, and $2$ router interfaces configured for high-availability default gateway redundancy. What is the total number of usable host IPv4 addresses provided by the smallest standard subnet mask that accommodates all required devices?

A network administrator needs to add a DNS entry that resolves the hostname `appserver.corp.local` directly to its assigned IPv6 address `2001:db8:85a3::8a2e:370:7334`. Which DNS resource record type must be configured for this resolution?

A client workstation on VLAN 20 initiates a connection and requests an IP address assignment from a centralized DHCP server residing on VLAN 100 via a Layer 3 switch interface configured with DHCP relay. Place the following stages of the relayed DHCPDISCOVER and DHCPOFFER packet lifecycle in the correct chronological sequence from first to last.

A network engineer is reviewing an active translation table on a corporate edge gateway to verify Port Address Translation (PAT) functionality. An internal client workstation with the private IP address $172.16.10.50$ initiates an HTTPS session to an external web server at $198.51.100.25:443$. The gateway translates all outbound traffic using its single public interface IP address of $203.0.113.1$. As the outgoing IP packet leaves the firewall's public interface toward the destination server, which address and port combination accurately represents the Inside Global identifier for this session?

A network technician needs to plan the installation of a new patch panel and power distribution unit (PDU) inside an existing equipment cabinet in an IDF. Which document should the technician consult to check the available vertical space and unit height positions inside the cabinet?

During a routine internal security audit, a network analyst discovers that administrators are using Telnet to remotely configure network infrastructure devices, exposing authentication credentials in unencrypted cleartext across internal subnets. Security policy requires immediately replacing this practice with Secure Shell (SSH) to secure all interactive administrative sessions. Which default port and transport layer protocol combination must be permitted on internal firewalls to allow SSH traffic?

A network architect is designing an enterprise IPv6 deployment and reviewing address allocation strategies and autoconfiguration modes. Match each IPv6 deployment mechanism or address scope on the left with its exact functional operation and protocol behavior on the right.

A network technician is configuring switch ports on an enterprise switch to handle 802.1Q trunking and VLAN operations. Match each switchport interface configuration command on the left with its corresponding frame processing or trunk negotiation behavior on the right.

A network administrator is documenting a host configuration and needs to compress the IPv6 address fe80:0000:0000:0000:0202:b3ff:fe1e:8329 using standard RFC 5952 rules. Which of the following is the correctly compressed IPv6 address?