Network + Practice Test 3

SSH (Secure Shell) is a protocol used for secure remote login and file transfer. It uses port 22 by default to establish a secure connection between the client and the server. FTP (File Transfer Protocol) uses port 21, DNS (Domain Name System) uses port 53, and Telnet uses port 23. Therefore, the correct answer is SSH.

100Base-FX should be used to avoid interference in an Ethernet LAN near heavy machinery because it uses fiber optic cables which are immune to electromagnetic interference (EMI). Fiber optic cables do not conduct electricity and therefore do not generate or pick up electromagnetic signals, making them ideal for environments with high levels of EMI.

The correct answer is nslookup because nslookup is a command-line tool used to query Domain Name System (DNS) to obtain domain name or IP address mapping. In this case, the output provided indicates that there was a DNS request timeout and the server name for the given address could not be found. This aligns with the purpose of nslookup, which is to perform DNS queries and obtain information about DNS records.

A network administrator would use a network-based firewall to create a DMZ. A DMZ (demilitarized zone) is a network segment that is isolated from the internal network and the internet, providing an additional layer of security. A network-based firewall is specifically designed to control and monitor network traffic, allowing or blocking access based on predefined security policies. By placing a network-based firewall between the internal network and the DMZ, the administrator can regulate the flow of traffic and protect the internal network from potential threats originating from the DMZ.

The technician should first identify the symptoms and potential causes of the issue before taking any further steps. This will help in understanding the problem and finding a suitable solution. By analyzing the symptoms and potential causes, the technician can narrow down the possibilities and troubleshoot effectively. It is important to gather all the necessary information before proceeding with any action plan or documentation.

Two small companies sharing a switch would most likely benefit from VLAN (Virtual Local Area Network) feature. VLAN allows the switch to divide a single physical network into multiple virtual networks, providing separate broadcast domains and improving network security. With VLAN, each company can have its own isolated network within the shared switch, ensuring privacy and preventing interference between the two companies' devices. This feature allows for better network management, scalability, and flexibility in terms of network configuration and resource allocation.

A multilayer switch would use the ARP (Address Resolution Protocol) to learn the IP address of a directly connected device. ARP is used to map an IP address to a MAC address in a local network. When a device wants to communicate with another device on the same network, it uses ARP to find the MAC address associated with the IP address of the destination device. This allows the multilayer switch to build and maintain its ARP table, which is used for forwarding network traffic efficiently.

The user would type in "arp-a" at the command prompt to display the MAC address. The "arp-a" command is used to view the ARP (Address Resolution Protocol) cache, which contains the IP addresses and corresponding MAC addresses of devices on the local network. By using this command, the user can check if the MAC address is correctly associated with the IP address, which can help troubleshoot network connectivity issues.

SCP (Secure Copy Protocol) and FTP (File Transfer Protocol) are both protocols used to transfer files between two systems. SCP is a secure file transfer protocol that uses SSH (Secure Shell) to provide encryption and authentication. FTP, on the other hand, is a standard network protocol that allows for the transfer of files between a client and a server on a computer network. Both protocols are widely used for transferring files over the internet or local networks.

100Base-FX has an advantage over 100Base-TX in terms of longer cable runs. This means that it can transmit data over longer distances without experiencing significant signal degradation. This is beneficial in situations where the network infrastructure requires data to be transmitted over longer distances, such as in large office buildings or campus environments.

Replacing the omnidirectional antennas with Yagi antennas would be the best solution to improve the link performance. Omnidirectional antennas radiate signals in all directions, resulting in a weaker and less focused signal. Yagi antennas, on the other hand, have a more directional beam pattern, allowing for a stronger and more focused signal. This would help increase the signal strength and improve the throughput across the link.

To create a CAT5e crossover cable, two tools are required: snips and a cable crimper. Snips are necessary to cut the CAT5e cable to the desired length, while a cable crimper is used to attach the connectors onto the cable ends. The other options listed, such as TDR, multimeter, and OTDR, are not relevant to the creation of a crossover cable.

CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is the correct answer. This mechanism is used to calculate the back-off time on an Ethernet link after a collision. CSMA/CD is a protocol used in Ethernet networks to avoid data collisions. When a collision occurs, the devices involved in the collision use a random back-off algorithm to determine when they can retransmit their data. This helps to minimize further collisions and maximize the efficiency of data transmission on the network.

The technician should re-terminate both ends of the cable to the 568B standard because the company implemented a policy stating that all cable terminations should adhere to the 568B standard. Since the wall jack has become loose, it is necessary to fix it by re-terminating both ends of the cable to ensure a secure and proper connection.

Port forwarding should be configured to resolve the problem of not being able to play online games while still being able to connect to websites. Port forwarding allows specific ports to be opened on the router, allowing incoming and outgoing data for certain applications or games. By configuring port forwarding, the technician can ensure that the necessary ports for online gaming are open, allowing the customer to play games without any connectivity issues.

An Intrusion Detection System (IDS) is a security tool that monitors network traffic and detects any suspicious or unauthorized activity or attempts to access the network. It analyzes network packets and compares them against a database of known attack signatures or abnormal behavior patterns. When an intrusion is detected, the IDS generates an alert or notification to the system administrator or security team, allowing them to respond and take appropriate action to prevent any potential security breaches. Unlike a firewall, which primarily focuses on blocking or allowing network traffic based on predefined rules, an IDS is specifically designed to detect and report unauthorized access attempts.

An IDS (Intrusion Detection System) would be the best software type for identifying an attack. IDS monitors network traffic and analyzes it for any signs of malicious activity or unauthorized access attempts. It can detect and alert administrators about potential attacks, allowing them to take appropriate action to prevent further damage. IPS (Intrusion Prevention System) is similar to IDS but also has the ability to actively block or prevent attacks. A packet sniffer is a tool used to capture and analyze network traffic, but it may not specifically focus on identifying attacks. A port scanner is used to identify open ports on a network, but it may not provide comprehensive attack identification capabilities.

1000Base-LX has the highest effective range at a greater expense compared to the other cable standards listed. This is because 1000Base-LX uses long-wavelength laser optics, allowing it to transmit data over longer distances, up to 10 kilometers. On the other hand, 1000Base-T uses twisted-pair copper cables and has a range of up to 100 meters. 1000Base-CX uses copper cables as well but has a shorter range of up to 25 meters. Lastly, 1000Base-SX uses short-wavelength optics and has a range of up to 550 meters. Therefore, 1000Base-LX offers the highest range but comes at a higher cost.

The 66 block termination point is CAT3 compliant, which means it is designed to support Category 3 cabling standards. Category 3 cabling is commonly used for telephone and data communication systems, providing a bandwidth of up to 16 MHz. This type of termination point is suitable for transmitting voice and low-speed data signals. It is not compatible with higher-speed applications like CAT6 or coaxial connections, which have greater bandwidth capabilities. Similarly, IEEE 1394 (FireWire) is a standard for high-speed data transfer, so it is not applicable to the 66 block termination point.

CAT5 UTP (Unshielded Twisted Pair) is a type of Ethernet cable commonly used for local area networks (LANs). It supports data transmission speeds of up to 1000 Mbps (megabits per second). Among the given LAN types, 100Base-TX is the only one that would utilize CAT5 UTP. 100Base-TX is an Ethernet standard that uses two pairs of twisted-pair cables, making it compatible with CAT5 UTP. 1000Base-T and 10GBase-SR, on the other hand, require higher-grade cables such as CAT5e or CAT6 for their higher data transmission speeds. 100Base-FX utilizes fiber optic cables instead of UTP.

The network administrator should reference the history logs to help identify the problem. History logs typically provide a record of past events and actions taken on the network devices. By reviewing the history logs, the administrator can track any recent changes or configurations made to the network devices that may have caused the Internet connectivity issue. This will help in troubleshooting and finding a solution to restore the Internet access for the affected users.

SNMPv3 is the correct answer because it is an updated version of the Simple Network Management Protocol (SNMP) that provides enhanced security features. SNMPv3 supports authentication, encryption, and access control, making it suitable for secure polling of network devices. SCP (Secure Copy Protocol) is used for secure file transfer, while SSH (Secure Shell) is used for secure remote access. SNMPv2 is an older version of SNMP and does not offer the same level of security as SNMPv3.

An Intrusion Prevention System (IPS) is a software type that is designed to identify and react to attacks by shutting down a port or dropping certain types of packets. It actively monitors network traffic, detects suspicious or malicious activity, and takes immediate action to prevent further damage or unauthorized access. Unlike a port scanner, which is used to discover open ports on a network, or a packet sniffer, which captures and analyzes network traffic, an IPS focuses on actively defending against attacks by blocking or filtering network traffic. An IDS (Intrusion Detection System) is similar to an IPS but lacks the ability to actively prevent attacks.

A network layer firewall operates at the network layer of the OSI model and is primarily responsible for filtering and controlling network traffic based on IP addresses, ports, and protocols. SMTP traffic, HTTP traffic, and ICMP messages are all types of network traffic that can be filtered by a network layer firewall. However, email sender verification is not a type of network traffic that can be filtered at the network layer. It is a process that involves checking the authenticity of the sender's email address, which typically occurs at the application layer of the OSI model. Therefore, a network layer firewall would be unable to filter email sender verification.

For roaming across a wireless 802.11g network, it is important for each access point to be configured to use the same SSID (Service Set Identifier). The SSID is a unique identifier that allows devices to connect to a specific wireless network. By using the same SSID, devices can seamlessly transition from one access point to another without having to reconnect or reconfigure their network settings. This ensures a smooth and uninterrupted connection as users move throughout the network coverage area.

Routing convergence time refers to the time required by protocols to update their forwarding tables after changes have occurred. This includes the process of exchanging routing information between routers, calculating the best paths, and updating the forwarding tables accordingly. During this time, the network may experience temporary disruptions or suboptimal routing until the convergence process is completed.

When upgrading the network infrastructure to support new VoIP telephony equipment, it is important to consider Power over Ethernet (PoE) as a primary feature when selecting a new switch. PoE allows the switch to provide power to the VoIP phones through the Ethernet cables, eliminating the need for separate power adapters. This simplifies the installation process and reduces cable clutter. Therefore, PoE is a crucial feature to ensure that the new switch can effectively support the power requirements of the VoIP phones.

The technician is able to successfully remote into the company's server, indicating that there is no issue with the physical network or VLAN configuration. Additionally, the technician is able to ping the other servers via their IP addresses, suggesting that there is no problem with DHCP configuration. However, the technician is unable to connect to the other servers' directories, indicating that there may be an issue with resolving the server names to their corresponding IP addresses. This suggests that DNS is not correctly configured, causing the problem.

SMF, or Single Mode Fiber, is a type of optical fiber that can be used for long distances, exceeding 2 kilometers. It uses laser light for transmission, which allows for higher bandwidth and longer transmission distances compared to other types of fiber. Additionally, SMF is known to have a higher cost compared to MMF, or Multimode Fiber. Therefore, the characteristics that best describe SMF are that it can be used for distances exceeding 2 kilometers and uses laser light for transmission.

The technician should determine the scope of the problem next in order to understand the extent of the issue. This step will help the technician in identifying the specific areas of the switch that are affected and the potential causes of the problem. By determining the scope, the technician can then proceed to implement an appropriate solution and create an action plan for reconfiguring the switch. Escalating the issue or implementing and testing the solution without first determining the scope may result in ineffective troubleshooting and potential further complications.

The technician should first implement an action plan. This is because when dealing with a virus infection, it is important to have a structured approach to address the issue. Implementing an action plan will help the technician prioritize tasks, allocate resources, and ensure a systematic and efficient response to the virus outbreak. Once the action plan is in place, the technician can then proceed with other troubleshooting steps such as applying the patch, documenting the solution, and waiting for virus definitions to be updated.

T3 refers to a type of telecommunications line that can transmit data at a maximum rate of 44.7Mbps. This makes it the correct answer to the question. T2, T5, and T1 are other types of telecommunications lines, but they do not have the same maximum data transfer rate as T3.

10GBase-LR is the best suited technology for a point-to-point circuit that is 6 kilometers in distance. The "LR" in 10GBase-LR stands for "long reach," indicating that it is designed for longer distance transmissions. It uses single-mode fiber optic cables, which have a higher capacity for transmitting data over longer distances compared to other options like 10GBase-T, which uses copper cables and is limited to shorter distances. 10GBase-ER and 10GBase-SR are also not suitable for this distance, as they are designed for even longer distances or shorter distances respectively.

Replacing RIP with a link-state routing protocol such as OSPF would improve convergence time. Link-state protocols have faster convergence times compared to distance-vector protocols like RIP. OSPF uses a more efficient algorithm to calculate the shortest path and updates routing tables more quickly. This allows the network to quickly adapt to changes in the network topology, such as a failed piece of equipment, and begin routing traffic around it in a shorter amount of time.

PPTP (Point-to-Point Tunneling Protocol) is a protocol that provides the actual encryption used over VPN (Virtual Private Network). It creates a secure tunnel between the user's device and the VPN server, encrypting the data that is transmitted over the network. This ensures that the data remains confidential and protected from unauthorized access. PPTP is commonly used for remote access VPNs and is supported by a wide range of devices and operating systems.

A patch panel would be used to connect a vertical cross connect when using data connections. A patch panel acts as a central point where multiple data cables can be terminated and organized. It allows for easy management and flexibility in connecting and disconnecting different devices or equipment. By using patch cables, connections can be easily made from the patch panel to the desired destination, such as switches or routers. This helps in organizing and maintaining the network infrastructure efficiently.

A network administrator would refer to a baseline documentation to discover a rogue WAP. A baseline is a set of standards and measurements that define the normal operating conditions of a network. By comparing the baseline with the current network conditions, any deviations or anomalies can be identified, including the presence of a rogue WAP. The baseline documentation provides a reference point for the network administrator to ensure the network is operating within expected parameters and to detect any unauthorized devices or configurations.

The maximum transmission distance of 10GBase-LR is 6 miles (9.7 kilometers). This standard is designed for long-range fiber optic connections and can transmit data up to a distance of 6 miles. It is commonly used in applications where there is a need for high-speed and long-distance communication, such as in data centers or telecommunications networks.

100Base-T uses a more flexible cable compared to 100BaseFX. This means that it can be easily installed and maneuvered in different environments. The flexibility of the cable allows for easier installation and maintenance, reducing the time and effort required for network setup. Additionally, the flexibility of the cable makes it more resistant to damage and breakage, ensuring a more reliable and stable network connection.

A multilayer switch would be used to connect different broadcast domains and allow them to communicate with each other. Unlike a bridge or a layer 2 switch, a multilayer switch operates at both layer 2 and layer 3 of the OSI model, meaning it can handle both MAC addresses and IP addresses. This allows it to route traffic between different networks or subnets, effectively connecting broadcast domains and enabling communication between them. A hub, on the other hand, simply broadcasts all incoming traffic to all connected devices without any intelligence or filtering capabilities.

Trunking is the advanced switch feature that allows multiple ports on switch A to be combined and managed as a single entity when connected to switch B. This feature enables the transmission of multiple VLANs over a single physical link, increasing network efficiency and reducing the number of physical connections required. Port mirroring is used for monitoring network traffic, VLAN is a logical grouping of network devices, and spanning tree is a protocol used to prevent loops in a network.

The next troubleshooting step the technician should take is to determine if anything has changed. This is because sudden loss of network connectivity can often be attributed to recent changes or updates made to the computer or network settings. By identifying any recent changes, the technician can narrow down the possible causes and focus on resolving the issue more effectively.

AES (Advanced Encryption Standard) is a strong encryption method that is commonly used in wireless networks. It is compatible with the WPA 2 standard and can be used with the existing wireless access points. Therefore, the encryption method that may not be compatible with the previously installed access points is not AES.

A toner probe is used to locate the positions in the cross connections between 66 blocks. It is a tool that helps in identifying and tracing the wiring connections. The toner probe sends a signal through the wiring, and the technician can use the probe to trace the signal and determine the location of the telephone connections. This tool is commonly used in telecommunications and network installations to troubleshoot and locate specific connections.

The correct answer is "arp-a". This command and switch combination would provide the output mentioned in the question. The "arp-a" command displays the ARP cache table, which includes the interface, internet address, physical address, and type of each entry.

T3 is the correct answer because it provides a 45 Mbps circuit over TDM (Time Division Multiplexing) equipment. T3 is a high-speed digital transmission line that uses DS-3 signaling, which provides a maximum data rate of 44.736 Mbps. It is commonly used for long-distance, high-bandwidth applications and is capable of carrying voice, data, and video traffic. SONET, E3, and OC12 are all different WAN technologies but do not specifically provide a 45 Mbps circuit over TDM equipment.

The correct answer is tracert. Tracert is a command used in Windows to trace the route taken by packets across an IP network. It sends a series of ICMP Echo Request messages to each hop along the path to a destination, and displays the round-trip time for each hop. In the given output, the "Request timed out" message indicates that the packets sent to the destination did not receive a response within the specified time limit. This can be useful in troubleshooting network connectivity issues.

SSL (Secure Sockets Layer) VPN is the most appropriate solution for the company's traveling sales employees who need secure access to corporate resources from nontrusted devices. SSL VPN uses encryption and authentication protocols to establish a secure connection between the employee's device and the corporate network. It allows employees to access resources through a web browser without requiring any additional software installation, making it convenient for accessing corporate resources from client sites or public computers. Additionally, SSL VPN provides granular access control, ensuring that only authorized individuals can access specific resources.

A smart jack would be used to relocate a T1 closer to the switch for connectivity. A smart jack is a device that is used to terminate a T1 line and provide connectivity to the switch. It is typically located near the switch and allows for easy access and troubleshooting of the T1 connection. Using a smart jack would allow for a shorter distance between the T1 and the switch, improving connectivity and reducing signal loss.

10GBase-T has the shortest transmission distance among the given Ethernet technologies. This is because 10GBase-T uses twisted pair copper cables for transmission, which have a limited distance capability compared to other technologies. 10GBase-SR, on the other hand, uses fiber optic cables and can transmit data over longer distances. Therefore, 10GBase-T is the correct answer.