Tüm alıştırma soruları

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 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?

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 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 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 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?

A network administrator is performing Variable Length Subnet Masking (VLSM) on an enterprise network segment. A router interface is currently assigned the IP address $10.140.77.218/21$. Upon inspecting the existing IP allocations, the administrator determines that subnets $10.140.72.0/23$ and $10.140.74.0/23$ are already assigned to production VLANs. What is the maximum number of additional $/26$ subnets that can be created using only the remaining unallocated address space within this parent $/21$ block?

A network administrator is provisioning a dedicated IPv4 subnet for a new VoIP deployment from an available $192.168.10.0/24$ network block. The subnet must accommodate $60$ IP phones, $2$ router interfaces operating VRRP for default gateway redundancy, and $1$ switch management interface. Which of the following CIDR prefixes represents the smallest subnet that fulfills all required host assignments while preserving the maximum amount of address space for future allocation?

A network technician is deploying a new fleet of VoIP desktop phones across multiple subnets. To automate initial provisioning, each phone must automatically receive the IP address or hostname of its TFTP boot server from the central DHCP server upon starting up. Which DHCP option should the technician configure within the DHCP scope to supply this provisioning server information?

An enterprise border router maintains two paths to reach a remote corporate subnet ($10.45.0.0/24$). Path 1 is learned via internal BGP (iBGP) with an Administrative Distance (AD) of 200, while Path 2 is learned via Open Shortest Path First (OSPF) with an AD of 110. Both routes report the exact same prefix length ($/24$). Network monitoring shows that traffic is actively taking Path 2 over the low-bandwidth OSPF backup link instead of the primary iBGP connection. Which configuration modification should the network administrator perform on the border router to ensure traffic prefers the primary iBGP link under normal operations?

A network technician needs to assign an IPv4 subnet mask to a network segment that must accommodate $28$ usable host devices. Which CIDR notation prefix fulfills this requirement while reserving the minimal amount of unused IP addresses?

A network host connected to interface FastEthernet $0/12$ on a Layer 2 switch transmits an Address Resolution Protocol (ARP) request broadcast frame. Interface FastEthernet $0/12$ is configured as an access port belonging to VLAN $50$. Which of the following actions will the switch perform upon receiving this frame?

A network engineer is implementing DHCP Relay Agent Information Option (Option 82) on Layer 2 access switches within an enterprise building. When a client sends a broadcast $DHCPDISCOVER$ message, the relay agent appends sub-options to the request before forwarding it to a centralized DHCP server across a routed core. Which sub-option field specifically carries identifying information about the physical switch port and VLAN from which the client request originated?

A network administrator is configuring perimeter security rules to allow an internal Remote Authentication Dial-In User Service (RADIUS) server to authenticate wireless users against an external partner system. Which transport protocol and destination port pair must be permitted through the firewall for standard RADIUS authentication traffic?

A network engineer is configuring a core router that learns a path to the $10.50.0.0/16$ network through multiple routing sources simultaneously: an internal OSPF advertisement, a RIPv2 advertisement, and a manually configured static route. All sources advertise the exact same prefix length. Which path will the router install into its active routing table, and why?

During a facility renovation, an IT team installs new workstations across multiple offices. A network technician needs to record the detailed mapping between individual wall outlet jacks, patch panel ports, and physical cable run paths back to the Intermediate Distribution Frame (IDF). Which type of documentation should the technician update to preserve this physical cabling location data?

A network administrator runs the `nslookup` command to check the mail server configuration for an enterprise domain and obtains the following output:

text
> set type=MX
> company.com
Server: dns1.internal.net
Address: 10.0.0.53

Non-authoritative answer:
company.com mail exchanger = 10 mail.company.com

Which DNS record type must be configured to map `mail.company.com` directly to its corresponding IPv4 address?