Tüm alıştırma soruları

A network technician is troubleshooting an issue where workstations in a remote branch office cannot resolve hostnames within the internal domain `internal.corp.com`, although external internet domains resolve normally. The technician runs diagnostic commands from a affected workstation with the following results:

> nslookup internal.corp.com
Server: 192.168.1.1
Address: 192.168.1.1#53

** server can't find internal.corp.com: SERVFAIL

> dig @10.10.20.5 internal.corp.com
;; QUESTION SECTION:
;internal.corp.com. IN A

;; ANSWER SECTION:
internal.corp.com. 3600 IN A 10.10.20.50

Based on the output, which TWO of the following are the most likely root causes of this name resolution failure? (Select TWO.)

A network technician is investigating why users on subnet $10.20.4.0/24$ cannot access a secure internal web portal at $10.20.10.15$ over HTTPS. The technician runs a traceroute command from a client workstation ($10.20.4.50$), which yields the following output:

Traceroute to 10.20.10.15 over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms 10.20.4.1
2 2 ms 1 ms 2 ms 10.20.1.2
3 * * * Request timed out.

An inspection of the router at $10.20.1.2$ reveals the following inbound Access Control List (ACL) applied on interface GigabitEthernet0/1:

access-list 105 permit tcp 10.20.4.0 0.0.0.255 host 10.20.10.15 eq 80
access-list 105 permit icmp 10.20.4.0 0.0.0.255 host 10.20.10.15

Based on these diagnostic outputs, which of the following is the root cause of the connection failure?

A network technician plugs a newly deployed workstation into switch port GigabitEthernet0/12. The host successfully obtains an IP address in the default management network (192.168.1.0/24) and can reach local hosts in that same network, but it is unable to access any resources on the Finance subnet (192.168.30.0/24). An inspection reveals that the switch port is still using its factory default configuration. Which of the following is the most likely cause of this connectivity issue?

A network technician is troubleshooting a workstation that cannot access external web services. Arrange the command-line network utilities in the correct logical sequence of execution to systematically isolate the issue from the local host configuration to external path reachability and name resolution.

A network administrator is performing baseline security hardening on a newly installed Layer 3 switch before introducing it to the production network. Place the administrative hardening tasks into the correct sequential order from first step to last step.

A network administrator is designing an out-of-band (OOB) management architecture for edge router console access and remote reboot capabilities during a primary network outage. Which of the following solutions should be implemented to achieve full OOB administrative control and power management under these conditions? (Select TWO).

A network technician is troubleshooting a connectivity issue where hosts on VLAN 20 ($192.168.20.0/24$) are unable to access an enterprise application server at $10.100.50.25$. Place the following diagnostic and remediation steps in the correct order according to standard CompTIA network troubleshooting methodology, from first step to last step.

A systems engineer is configuring a Layer 3 switch to relay DHCP requests from client devices on `Vlan 40` ($10.40.0.0/24$) to a centralized DHCP server located on `Vlan 100` ($172.16.100.10$). Workstations on `Vlan 40` fail to obtain IP leases and default to APIPA addresses ($169.254.x.x$). Packet captures confirm that client DHCPDISCOVER broadcast packets reach interface `Vlan 40`, but the switch never forwards them to $172.16.100.10$. Reviewing the switch configuration reveals that `ip helper-address 172.16.100.10` was applied to interface `Vlan 100` instead of interface `Vlan 40`. Which of the following statements correctly explains why client leasing is failing and identifies the necessary correction?

A network administrator is conducting a post-implementation review of a enterprise wireless deployment across various campus zones. Match each observed wireless signal anomaly to its underlying radio frequency (RF) or configuration cause.

A security analyst is reconfiguring the wireless network for a regional medical center's mobile workstation carts to meet stringent health data protection standards. The organization mandates upgrading to WPA3-Enterprise 192-bit mode. Which of the following requirements must be implemented to achieve this configuration? (Select TWO.)

A network technician is inspecting a newly terminated Cat 6 Ethernet patch cable that is failing to transmit data. To confirm that each of the eight individual conductors is connected to its corresponding pin on both ends without any open circuits or shorts, which diagnostic tool should the technician use?

A network administrator is troubleshooting network reachability for a newly installed server in an enterprise datacenter. The host is assigned the IPv4 address $172.16.50.130$ with a subnet mask of $255.255.255.192$ ($/26$). The administrator discovers that while the host can ping its local loopback address, it cannot establish SSH connections to a remote server at $172.16.50.200/26$ or reach external networks.

The host IP configuration is verified as follows:
- IPv4 Address: $172.16.50.130$
- Subnet Mask: $255.255.255.192$
- Default Gateway: $172.16.50.126$

The router interface servicing this VLAN is configured as follows:
text
interface GigabitEthernet0/0.50
encapsulation dot1Q 50
ip address 172.16.50.129 255.255.255.192
ip access-group VLAN50_IN in
!
ip access-list extended VLAN50_IN
permit tcp 172.16.50.128 0.0.0.63 any eq 22
permit icmp 172.16.50.128 0.0.0.63 any

Which of the following identifies the primary root cause of the connectivity failure?

Match each physical network cabling fault or diagnostic condition on the left with its underlying physical cause on the right.

A network administrator is configuring a new wireless network for a corporate branch office. Company security policy mandates that every employee must authenticate using their individual domain accounts against a centralized RADIUS server, preventing the use of a shared network passphrase. Which WPA3 security mode and authentication mechanism should the administrator configure on the Wireless LAN Controller (WLC)?

A workstation on a corporate network is unable to connect to local network resources or access the internet. A technician executes `ipconfig /all` on the workstation and observes an IPv4 address of $169.254.45.12$ with a subnet mask of $255.255.0.0$. Which of the following is the most likely cause of this connectivity issue?

Following a recent core switch update, enterprise workstations connected to VLAN 30 ($10.30.0.0/24$) fail to communicate outside their local subnet. Preliminary reports indicate workstations are assigning themselves addresses in the range $169.254.0.0/16$. Place the following diagnostic and remediation steps in the correct chronological sequence to isolate and resolve this DHCP assignment failure according to standard network troubleshooting methodology.

A network analyst suspects that an improper MTU size configuration on a newly deployed site-to-site IPsec VPN gateway is causing large HTTPS file transfers to fail. The analyst performs a ping sweep using unfragmented packets ($1400$ bytes with the Don't Fragment flag set) and confirms that packets exceeding $1380$ bytes are dropped at the tunnel interface. Having verified the cause of the issue, which step should the analyst take next according to the CompTIA troubleshooting methodology?

A network administrator is designing a performance monitoring strategy for an enterprise infrastructure. Match each performance telemetry protocol or monitoring mechanism on the left with its primary operational characteristic on the right.

A network technician is responding to connectivity issues reported by forklift operators in a distribution warehouse. The operators report that handheld Wi-Fi scanners frequently disconnect and fail to roam when driving deep into storage aisles. A wireless site survey indicates that while ceiling-mounted omnidirectional Access Points (APs) along the central walkway maintain strong signal strength of $-60\text{ dBm}$, the signal drops significantly to $-85\text{ dBm}$ inside the aisle rows filled with metallic racks and densely stacked inventory. Which of the following is the primary cause of this issue, and what is the most effective solution?

A network engineer configures a stateless router Access Control List (ACL) to allow client workstations on subnet $10.50.1.0/24$ to access an internal web server at $172.16.10.20$. The engineer applies the inbound rule `permit tcp 10.50.1.0 0.0.0.255 host 172.16.10.20 eq 80` on the interface facing the web server. Although initial packets reach the server, workstation browsers consistently time out when attempting to load web pages. Which configuration change will resolve this connection failure?