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NEW QUESTION # 374
A technician knows the MAC address of a device and is attempting to find the device's IP address. Which of the following should the technician look at to find the IP address? (Select TWO).
- A. ARP table
- B. IP route table
- C. DNS cache
- D. STP topology
- E. MAC address table
- F. DHCP leases
Answer: A,F
Explanation:
* A MAC address is a unique identifier assigned to a network interface card (NIC) that allows it to communicate on a physical network layer, such as Ethernet1. An IP address is a logical identifier assigned to a device that allows it to communicate on a network layer, such as IP2.
* A technician can use different methods to find the IP address of a device if they know its MAC address.
Two of the most common methods are looking at the ARP table and the DHCP leases.
* The ARP table is a data structure that stores the mappings between IP addresses and MAC addresses on a device. ARP stands for Address Resolution Protocol, which is a network protocol that enables devices to discover the MAC address of another device based on its IP address3. The ARP table is populated by sending ARP requests and receiving ARP replies, or by using static ARP entries that are manually configured4.
* A technician can look at the ARP table of their own device or a nearby device, such as a router or a switch, to find the IP address of a device with a known MAC address. For example, on a Windows device, the technician can use the command arp -a to display the ARP table, and look for the entry that matches the MAC address. On a Cisco device, the technician can use the command show ip arp to display the ARP table, and look for the entry that matches the MAC address.
* The DHCP leases are the records of the IP addresses that are assigned by a DHCP server to DHCP clients. DHCP stands for Dynamic Host Configuration Protocol, which is a network protocol that enables devices to obtain IP addresses and other network configuration parameters automatically from a DHCP server. The DHCP leases contain information such as the IP address, the MAC address, the lease duration, and the expiration time of each DHCP client.
* A technician can look at the DHCP leases of the DHCP server that serves the network segment where the device with the known MAC address is connected. For example, on a Windows DHCP server, the technician can use the DHCP console to view the DHCP leases, and look for the entry that matches the MAC address. On a Cisco DHCP server, the technician can use the command show ip dhcp binding to view the DHCP leases, and look for the entry that matches the MAC address.
* The other options are incorrect for the following reasons:
* C. IP route table is a data structure that stores the routes to different network destinations on a device. It does not store the MAC addresses of the devices on the network.
* D. DNS cache is a data structure that stores the mappings between domain names and IP addresses on a device. DNS stands for Domain Name System, which is a network service that translates human-readable domain names into IP addresses. It does not store the MAC addresses of the devices on the network.
* E. MAC address table is a data structure that stores the mappings between MAC addresses and switch ports on a switch. It does not store the IP addresses of the devices on the network.
* F. STP topology is a network design that uses the Spanning Tree Protocol (STP) to prevent loops and create a loop-free logical topology on a switched network. It does not store the IP addresses or the MAC addresses of the devices on the network. References:
* 1: MAC address - Wikipedia
* 2: IP address - Wikipedia
* 3: Address Resolution Protocol - Wikipedia
* 4: How ARP Works
* : How to Use the Arp Command in Windows
* : show ip arp
* : Dynamic Host Configuration Protocol - Wikipedia
* : DHCP Lease
* : View DHCP Leases
* : show ip dhcp binding
* : Routing table - Wikipedia
* : Domain Name System - Wikipedia
* : DNS cache - Wikipedia
* : MAC address table - Wikipedia
* : Spanning Tree Protocol - Wikipedia
NEW QUESTION # 375
A technician is troubleshooting a SQL database connection. After remotely connecting to the end client, the technician tests basic connectivity. Which of the following ports is available to connect via command-line interface?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
The correct port available for connecting to a SQL database via command-line interface is D. 1521. Port 1521 is the default port for Oracle Database connections using the Oracle Net Services (SQL*Net) protocol.
Port 143: This is used for IMAP (Internet Message Access Protocol) communication.
Port 445: This is used for Microsoft's SMB (Server Message Block) protocol (file and printer sharing).
Port 993: This is used for secure IMAP (IMAPS) communication.
Port 1521: This is the default port for Oracle Database connections using the Oracle Net Services (SQL*Net) protocol.
NEW QUESTION # 376
A security team would like to use a system in an isolated network to record the actions of potential attackers. Which of the following solutions is the security team implementing?
- A. Honeypot
- B. Network segmentation
- C. Perimeter network
- D. Zero trust infrastructure
Answer: A
NEW QUESTION # 377
Users in a remote office report that corporate web server pages are taking a long time to load, whereas users in the main corporate office do not have any issues. Which of the following is the best metric for a network administrator to check?
- A. Server interface CRC errors
- B. Server NetFlow data
- C. Jitter across the network
- D. Hop-by-hop network latency
Answer: D
Explanation:
The best metric for a network administrator to check is hop-by-hop network latency. This is because network latency is the time it takes for a packet to travel from the source to the destination, and it affects the loading speed of web pages. Hop-by-hop network latency measures the latency between each pair of routers or switches along the network path, and it can help identify where the delay is occurring. By checking the hop-by-hop network latency, the network administrator can determine if the problem is caused by a slow or congested link, a misconfigured or faulty device, or a routing issue.
Jitter is the variation in latency over time, and it affects the quality of voice and video applications. Jitter does not directly affect the loading speed of web pages, and it is not a useful metric for troubleshooting this issue.
Server interface CRC errors are errors that occur when the cyclic redundancy check (CRC) of a packet does not match the expected value, indicating data corruption. Server interface CRC errors can affect the reliability and integrity of data transmission, and they can be caused by faulty cables, connectors, or interfaces. Server interface CRC errors do not necessarily affect the loading speed of web pages, unless they are severe enough to cause retransmissions or packet loss.
Server NetFlow data is data that is collected and analyzed by the NetFlow protocol, which monitors and reports on network traffic flows. Server NetFlow data can provide information on the volume, type, and direction of traffic that is sent or received by the server, as well as the source and destination IP addresses, ports, and protocols. Server NetFlow data can help identify network usage patterns, trends, and anomalies, but it does not measure the latency or performance of the network.
Reference What is Network Latency and How to Measure It How to Troubleshoot Network Latency Issues What is Jitter and How to Measure It What is CRC Error and How to Fix It What is NetFlow and How Does It Work CompTIA Network+ Certification All-in-One Exam Guide, Eighth Edition (Exam N10-008)
NEW QUESTION # 378
A technician is equipped with a tablet, a smartphone, and a laptop to troubleshoot a switch with the help of support over the phone. However, the technician is having issues interconnecting all these tools in troubleshooting the switch. Which of the following should the technician use to gain connectivity?
- A. LAN
- B. PAN
- C. MAN
- D. WAN
Answer: B
Explanation:
If there is LAN connectivity, the devices should already be connected. In this case, PAN (Personal Area Network) would be a viable alternative to interconnect the devices. PAN is a type of network used for communicating between devices in close proximity to one another, typically within the range of a few meters. It can be established using wireless technologies such as Bluetooth or Wi-Fi Direct, which would allow the technician to connect their tablet, smartphone, and laptop and troubleshoot the switch more effectively.
NEW QUESTION # 379
A company that uses VoIP telephones is experiencing intermittent issues with one-way audio and dropped conversations The manufacturer says the system will work if ping times are less than 50ms. The company has recorded the following ping times:
Which of the following is MOST likely causing the issue?
- A. Attenuation
- B. Jitter
- C. VLAN mismatch
- D. Latency
Answer: B
Explanation:
Jitter is most likely causing the issue of intermittent one-way audio and dropped conversations for the company that uses VoIP telephones. Jitter is a variation in delay of packets arriving at the destination. It can cause choppy or distorted audio quality for VoIP applications, especially over WAN links that have limited bandwidth and high latency. The recommended jitter for VoIP is less than 10ms1. The company has recorded ping times that exceed 50ms, which indicates high jitter and latency on their network. Reference: https://www.voip-info.org/voip-jitter/ 1
NEW QUESTION # 380
Which of the following is the physical security mechanism that would MOST likely be used to enter a secure site?
- A. A landing page
- B. A smart locker
- C. A firewall
- D. An access control vestibule
Answer: D
Explanation:
Reference: https://en.wikipedia.org/wiki/Mantrap_(access_control)
NEW QUESTION # 381
While setting up a new workstation, a technician discovers that the network connection is only 100 full duplex (FD), although it is connected to a gigabit switch.
While reviewing the interface information in the switch CLI, the technician notes the port is operating at IOOFD but Shows many RX and TX errors. The technician moves the computer to another switchport and experiences the same issues.
Which of the following is MOST likely the cause of the low data rate and port errors?
- A. Duplex issues
- B. Incorrect pinout
- C. Cable length
- D. Bad switch ports
Answer: B
Explanation:
* A pinout is the arrangement of wires or pins in a cable or connector that determines how the signals are transmitted and received. A pinout can be either straight-through, which means that the wires or pins are connected in the same order on both ends of the cable or connector, or crossover, which means that the wires or pins are swapped on one end of the cable or connector.
* An incorrect pinout is a likely cause of the low data rate and port errors, because it can prevent the proper communication between the workstation and the switch. If the pinout is not compatible with the devices or the standards, the signals may be distorted, lost, or misinterpreted, resulting in errors and reduced performance. For example, if the workstation and the switch use different Ethernet standards, such as 10BASE-T and 1000BASE-T, they may require different pinouts to operate correctly. If the cable or connector has a mismatched pinout, the workstation and the switch may not be able to negotiate the optimal speed and duplex settings, and may fall back to a lower data rate, such as 100 full duplex, or experience many RX and TX errors.
* Therefore, option D is the most likely answer, as the incorrect pinout needs to be corrected to provide the optimal data rate and port performance. The technician needs to check the cable and connector types, standards, and pinouts, and replace them with the appropriate ones that match the workstation and the switch specifications.
* Option A is not a likely answer, as the bad switch ports would affect the connectivity and performance of any device that is connected to them, not just the workstation. If the technician moves the computer to another switchport and experiences the same issues, it indicates that the problem is not with the switch ports, but with the workstation, the cable, or the connector.
* Option B is also not a likely answer, as the duplex issues would affect the mode of data transmission between the workstation and the switch, not the data rate or the port errors. The duplex issues can be either half-duplex, which means that data can be transmitted in one direction at a time, or full-duplex, which means that data can be transmitted in both directions simultaneously. The duplex issues can cause collisions or interference if the workstation and the switch have different duplex settings, but they would not cause the data rate to drop to 100 full duplex, or cause many RX and TX errors.
* Option C is also not a likely answer, as the cable length would affect the signal strength and quality of
* the data transmission, not the data rate or the port errors. The cable length can cause attenuation, which is the loss of signal power over distance, or crosstalk, which is the interference from adjacent wires or cables. The cable length can cause the data transmission to be degraded or corrupted, but it would not cause the data rate to drop to 100 full duplex, or cause many RX and TX errors.
References:
* CompTIA Network+ N10-008 Study Guide, Chapter 2: Network Devices and Technologies, Section
2.1: Network Cabling and Connectors, Page 661
* Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 2.1: Network Cabling and Connectors, Page 92
* What is a Pinout? | Definition and Examples3
* Ethernet Cable Pinouts - Cisco
* Troubleshooting Ethernet Cable Problems - Cisco
NEW QUESTION # 382
A technician wants to deploy a new wireless network that comprises 30 WAPs installed throughout a three-story office building. All the APs will broadcast the same SSID for client access. Which of the following BEST describes this deployment?
- A. Unified service set
- B. Independent basic service set
- C. Basic service set
- D. Extended service set
Answer: D
Explanation:
Explanation
An extended service set (ESS) is a wireless network that consists of multiple access points (APs) that share the same SSID and are connected by a wired network. An ESS allows wireless clients to roam seamlessly between different APs without losing connectivity. A basic service set (BSS) is a wireless network that consists of a single AP and its associated clients. An independent basic service set (IBSS) is a wireless network that consists of a group of clients that communicate directly without an AP. A unified service set is not a standard term for a wireless network. References:
https://partners.comptia.org/docs/default-source/resources/comptia-network-n10-008-exam-objectives-(2-0),
https://en.wikipedia.org/wiki/Service_set_(802.11_network)
NEW QUESTION # 383
During an annual review of policy documents, a company decided to adjust its recovery time frames. The company agreed that critical applications can be down for no more than six hours, and the acceptable amount of data loss is no more than two hours. Which of the following should be documented as the RPO?
- A. Eight hours
- B. Two hours
- C. Four hours
- D. Six hours
Answer: B
NEW QUESTION # 384
An IT technician installs five old switches in a network. In addition to the low port rates on these switches, they also have improper network configurations. After three hours, the network becomes overwhelmed by continuous traffic and eventually shuts down. Which of the following is causing the issue?
- A. Routing loops
- B. Collisions
- C. Broadcast storm
- D. IP settings
Answer: C
NEW QUESTION # 385
A network technician was recently onboarded to a company. A manager has tasked the technician with documenting the network and has provided the technician With partial information from previous documentation.
Instructions:
Click on each switch to perform a network discovery by entering commands into the terminal. Fill in the missing information using drop-down menus provided.
Answer:
Explanation:
See the Explanation for detailed information on this simulation.
Explanation
(Note: Ips will be change on each simulation task, so we have given example answer for the understanding) To perform a network discovery by entering commands into the terminal, you can use the following steps:
Click on each switch to open its terminal window.
Enter the command show ip interface brief to display the IP addresses and statuses of the switch interfaces.
Enter the command show vlan brief to display the VLAN configurations and assignments of the switch interfaces.
Enter the command show cdp neighbors to display the information about the neighboring devices that are connected to the switch.
Fill in the missing information in the diagram using the drop-down menus provided.
Here is an example of how to fill in the missing information for Core Switch 1:
The IP address of Core Switch 1 is 192.168.1.1.
The VLAN configuration of Core Switch 1 is VLAN 1: 192.168.1.0/24, VLAN 2: 192.168.2.0/24, VLAN 3: 192.168.3.0/24.
The neighboring devices of Core Switch 1 are Access Switch 1 and Access Switch 2.
The interfaces that connect Core Switch 1 to Access Switch 1 are GigabitEthernet0/1 and GigabitEthernet0/2.
The interfaces that connect Core Switch 1 to Access Switch 2 are GigabitEthernet0/3 and GigabitEthernet0/4.
You can use the same steps to fill in the missing information for Access Switch 1 and Access Switch 2.
NEW QUESTION # 386
You are tasked with verifying the following requirements are met in order to ensure network security.
Requirements:
Datacenter
Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage Provide a dedicated server to resolve IP addresses and hostnames correctly and handle port 53 traffic Building A Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage Provide devices to support 5 additional different office users Add an additional mobile user Replace the Telnet server with a more secure solution Screened subnet Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage Provide a server to handle external 80/443 traffic Provide a server to handle port 20/21 traffic INSTRUCTIONS Drag and drop objects onto the appropriate locations. Objects can be used multiple times and not all placeholders need to be filled.
Available objects are located in both the Servers and Devices tabs of the Drag & Drop menu.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.
Answer:
Explanation:
See explanation below
Explanation:
Screened Subnet devices - Web server, FTP server
Building A devices - SSH server top left, workstations on all 5 on the right, laptop on bottom left DataCenter devices - DNS server.
NEW QUESTION # 387
After HVAC failures caused network outages, the support team decides to monitor the temperatures of all the devices. The network administrator cannot find a command that will display this information. Which of the following will retrieve the necessary information?
- A. Network baseline configurations
- B. Security information and event management
- C. SNMP OID values
- D. NetFlow data export
Answer: C
Explanation:
Explanation
The network administrator can use the Simple Network Management Protocol (SNMP) to monitor the temperatures of all the devices. SNMP is a widely-used protocol for managing and monitoring network devices, such as routers, switches, servers, and other networking equipment. SNMP allows network administrators to gather information about the performance and status of devices on the network, including temperature readings.
To retrieve the temperature information, the administrator will have to configure SNMP on the devices and configure SNMP manager software on their computer. Once the SNMP manager software is configured, it will be able to send SNMP requests to the devices and retrieve information such as temperature, voltage, fan speeds, etc. Many network devices have built-in SNMP support, and the administrator may also need to install SNMP agent software on the devices to enable SNMP monitoring.
The administrator can also use some specific command or tool like IPMI (Intelligent Platform Management Interface) or DCIM (Data Center Infrastructure Management) tools for monitoring the temperatures of all the devices.
NEW QUESTION # 388
Within the realm of network security, Zero Trust:
- A. block malicious software that is too new to be found in virus definitions.
- B. prevents attackers from moving laterally through a system.
- C. stops infected files from being downloaded via websites.
- D. allows a server to communicate with outside networks without a firewall.
Answer: B
Explanation:
Explanation
Zero Trust is a security framework that requires all users, whether in or outside the organization's network, to be authenticated, authorized, and continuously validated for security configuration and posture before being granted or keeping access to applications and data. Zero Trust prevents attackers from moving laterally through a system by applying granular policies and controls based on the principle of least privilege and by segmenting and encrypting data flows across the network. References:
https://partners.comptia.org/docs/default-source/resources/comptia-network-n10-008-exam-objectives-(2-0),
https://www.crowdstrike.com/cybersecurity-101/zero-trust-security/
NEW QUESTION # 389
......
CompTIA N10-008 certification exam is the latest version of the CompTIA Network+ certification, which has been updated to reflect the latest trends and developments in the networking industry. The new exam covers a wide range of topics, including network technologies, network devices, installation and configuration, media and topologies, network management, security, and troubleshooting. N10-008 exam also covers the latest technologies such as cloud computing, virtualization, and mobile devices.
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