Tüm alıştırma soruları

A network administrator is configuring advanced radio resource management settings across an enterprise wireless deployment. Match each wireless deployment feature on the left with its primary operational mechanism or deployment purpose on the right.

A network technician is troubleshooting a high optical insertion loss issue on a 10Gbps multimode fiber optic link connecting two distribution switches. An optical power meter indicates a lower-than-expected power level, but no complete signal break is detected along the cable span. The technician suspects physical contamination on the connector ferrule. Which tool should the technician use to visually inspect the connector end-face for microscopic dirt, scratches, or oil?

A network administrator is deploying a web application server that operates exclusively on an IPv6 address (`2001:db8:85a3::8a2e:370:7334`). While workstations can access the application using the raw IPv6 address, attempting to connect using the hostname `app.corp.contoso.com` fails. The administrator inspects the internal authoritative DNS zone file and finds the following resource record entry:

text
app.corp.contoso.com. 3600 IN A 2001:db8:85a3::8a2e:370:7334

Which of the following configuration changes is required to resolve the hostname resolution issue?

A network administrator must restore a critical database server following a storage array failure on Thursday at 14:00. The existing backup policy executes a full backup every Sunday at midnight and cumulative differential backups every night at 23:00 from Monday through Saturday. Which of the following procedures requires the minimum number of restore steps to recover the database to its state as of Wednesday night?

A network administrator is troubleshooting an issue where client machines on the subnet $10.0.50.0/24$ cannot establish connections to an internal HTTPS portal hosted at $10.0.50.200$. The administrator runs the `netstat -an` utility directly on the destination server hosting the portal and receives the following output snippet:

Active Connections

Proto Local Address Foreign Address State
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING
TCP 0.0.0.0:443 0.0.0.0:0 LISTENING
TCP 10.0.50.200:443 10.0.50.45:51204 ESTABLISHED
UDP 0.0.0.0:500 *:*

To verify local network layer mapping on a client machine ($10.0.50.45$) that is experiencing intermittent timeouts, which command-line utility should the technician use to inspect the cached IP-to-MAC address bindings?

A network technician is troubleshooting a performance issue on a newly installed network switch port connected to a high-volume server. Monitoring tools report low overall throughput, a high count of frame check sequence (FCS) errors, and a constantly incrementing late collision counter on the switch port interface. The interface status shows the link is operational at 100 Mbps. Which of the following is the most likely cause of this issue?

A network technician is installing three adjacent wireless access points along a corridor in an office building using the 2.4 GHz band with 20 MHz channel widths. To prevent co-channel interference and signal degradation, which combination of non-overlapping channels should be assigned to these access points?

Match each physical layer cabling issue or task with the diagnostic tool best suited to identify or resolve it.

A network administrator is investigating a name resolution issue where workstations can reach an internal server via IPv4, but fail to resolve its IPv6 address using the internal DNS server at $10.0.10.5$. The administrator needs to query the specified DNS server directly to verify if an IPv6 mapping exists for `app.lab.internal`.

Which TWO of the following command-line diagnostic utilities and syntax options will successfully query the targeted DNS server specifically for the host's IPv6 ($AAAA$) record? (Select TWO)

A client workstation attempts to resolve the domain name `www.example.com`, which is not stored in any local cache. Arrange the steps of the un-cached recursive DNS resolution process in the correct chronological order from first to last.

A network administrator executes the following `dig` commands from a diagnostic workstation to verify DNS records for a newly deployed VoIP gateway operating at IP address `192.168.10.50`:

text
$ dig +short SRV _sip._udp.corp.example.com
10 60 5060 voice01.corp.example.com.

$ dig +short -x 192.168.10.50
voice01.corp.example.com.

Based on the output provided above, which TWO of the following DNS record types are returning active, authoritative information for this gateway?

A network administrator is troubleshooting an 802.1Q trunk link between Switch-A and Switch-B. Host computers on VLAN 20 attached to Switch-B are unable to communicate with the default gateway located on Switch-A. Inspection of the trunk configuration reveals two issues: Switch-A is configured with native VLAN 20 while Switch-B is configured with native VLAN 1, and VLAN 20 is currently missing from the allowed VLAN list on Switch-B's trunk interface. Which TWO of the following statements accurately explain the technical causes of the communication failure in this setup? (Select TWO.)

Following a catastrophic data center power outage, a network administrator is executing the business continuity disaster recovery plan to bring enterprise services back online. To prevent system startup failures caused by missing infrastructure dependencies, arrange the following service restoration steps in the correct chronological order from first to last.

A network administrator is designing a multi-AP enterprise wireless deployment across an open office floor plan to support both legacy endpoints and high-density Wi-Fi 6 (802.11ax) clients. The objective is to maximize throughput and channel efficiency while preventing co-channel and adjacent-channel interference across the facility. Which of the following deployment configurations should the administrator implement? (Select TWO.)

A network technician is troubleshooting a newly installed Category 6A UTP cable run that is failing performance certification tests due to excessive Near-End Crosstalk (NEXT). A visual inspection of the patch panel terminations reveals that all eight conductors are connected to their corresponding pin positions according to the T568B standard. Which of the following installation flaws is the most likely cause of the excessive NEXT?

A network technician is troubleshooting connectivity for a VoIP desk phone on VLAN 80 ($10.80.0.0/24$). The phone boots up and receives an IP address lease, but it cannot register with the central PBX server located on VLAN 10 ($10.10.0.10/24$). Running a network status command on the phone reveals the following output:

text
IPv4 Address . . . . . . . . . . . : 10.80.0.45
Subnet Mask . . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . . : 10.80.1.1
DHCP Server . . . . . . . . . . . . : 10.80.0.1
DHCP Option 066 (TFTP Server) . . . : 10.10.0.10

Which of the following is the primary cause of the registration failure?

A systems administrator is investigating DNS resolution issues where internal clients receive truncated response errors when requesting resource-heavy records from a local name server. Running `dig` on a diagnostic host returns the following command output:

;; Truncated, retrying in TCP mode.
;; Connection to 10.20.4.15#53(10.20.4.15) failed: connection refused.

Based on this diagnostic output, what is the primary cause of the DNS resolution failure, and how should it be resolved?

A network administrator is troubleshooting an issue where users are unable to access a secure website hosted on an internal Linux server. The administrator executes the command `netstat -an` on the server and receives the following output snippet:

text Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN

Based on this output, which of the following is the primary cause of the connectivity failure?

A network technician is troubleshooting connectivity issues following a switch maintenance window. Workstations assigned to VLAN 45 on an edge switch can no longer communicate with the default gateway hosted on the core switch, whereas hosts on VLAN 10 attached to the same edge switch maintain uninterrupted access. The trunk link between the switches is configured using 802.1Q. Output from `show interfaces trunk` on the core switch shows the allowed VLAN list on interface GigabitEthernet0/1 is set to `10,20,30`. Which of the following configuration changes on the core switch will resolve the connectivity issue for VLAN 45?

A network administrator is conducting a post-deployment audit of a retail store's wireless network following complaints of poor performance. The site survey reveals high packet retransmission rates and severe degradation on the $2.4\text{ GHz}$ spectrum. Upon examining the access point (AP) configurations, the administrator discovers that three neighboring APs operating with $20\text{ MHz}$ channel widths are configured on channels 1, 4, and 9, respectively. Which modification to the channel configuration plan will best eliminate adjacent channel interference (ACI)?