Lesson 6: Supporting Network Services Flashcards
A network technician troubleshoots an issue where the video conferencing system keeps freezing up and dropping out. The technician determines that the network is not congested and the signal is not being processed fast enough to meet the streaming requirement. What is this type of issue known as?
A. Latency
B. VoIP
C. QoS
D. Jitter
A. Latency
This issue is known as latency which is the time it takes for a signal to reach the recipient. Processing delays at intermediate systems, such as routers, can cause latency to be worse.
Other options
B. Voice over Internet Protocol (VoIP) is a generic name for protocols that carry voice traffic over data networks.
C. Quality of service (QoS) means that switches, access points, and routers are all configured to identify VoIP data and prioritize it over bursty data.
D. Jitter is the amount of variation in delay over time and network technicians can measure it by sampling the elapsed time between packets arriving. Jitter is typically caused by network congestion.
A network technician securely connects to a remote server on port 3389. What protocol does the technician use?
A.LDAP
B.SSH
C.Telnet
D.RDP
D. RDP
Remote Desktop Protocol (RDP) is Microsoft’s protocol for operating remote graphical user interface (GUI) connections to a Windows machine. RDP uses port TCP/3389.
Other options
A. The Lightweight Directory Access Protocol (LDAP) is a TCP/IP protocol used to query and update an X.500 directory, and current directory products widely support it.
B. Secure Shell (SSH) is the principal means of obtaining secure remote access to UNIX and Linux servers and most types of network appliances (switches, routers, and firewalls).
C. Telnet is both a protocol and a terminal emulation software tool that transmits shell commands and output between a client and the remote host.
As traffic is overloading an organization’s website, the network administrator sets up another web server. What will the administrator configure to distribute traffic between the two servers?
A.NAT
B.Proxy server
C.UTM
D.Load balancer
D. Load Balancer
A load balancer distributes client requests across server nodes in a farm or pool and can deploy in any situation where there are multiple servers providing the same function.
Other options
A. In a port-based or overloaded network address translation (NAT), a NAT device translates between the private IP addresses used on the LAN and the public IP address on the router’s WAN interface.
B. A proxy server takes a whole HTTP request from a client, checks it, then forwards it to the destination server on the Internet, and reverses the process when the reply comes back.
C. A unified threat management (UTM) appliance enforces a variety of security policies and controls, combining the work of multiple security functions
A network technician troubleshoots a computer that is getting a limited connectivity message and an address in the automatic private IP addressing (APIPA) 169.254.x.y range instead of receiving a lease for an IP configuration from the DHCP server. What are some steps the technician should take to troubleshoot this issue? (Select all that apply.)
A.Establish the scope of the issue.
B.Check the configuration of patch cords.
C.Check the VLAN configuration.
D.Sample the elapsed time between arriving packets.
A. Establish the scope of the issue, B. Check the configuration of patch cords and C. Check the VLAN configuration
A. The technician should establish the scope of the issue. If the issue affects multiple users, the problem is likely to be the Dynamic Host Configuration Protocol (DHCP) server itself.
B. The technician should check the configuration of the patch cords and verify that the wall port connects to an appropriate port on a switch via the patch panel.
C. The technician should check the virtual LAN (VLAN) configuration. If the switch port does not have the correct VLAN ID, it can have the same effect as connecting the host to the wrong switch port.
Other options
D. Sampling the elapsed time between arriving packets is a method the technician would use to test for jitter in a voice over IP network.
A network technician uses a switch configuration interface and sees that a port is continually transitioning between up and down states. What does the network technician witness?
A.Port flapping
B.Slow network speeds
C.RSSI
D.QoS
A. Port Flapping
Port flapping is when the network interface card (NIC) or switch interface transitions continually between up and down states. Bad cabling, external interference, or a faulty NIC at the host end can cause this to happen.
Other options
B. There are a variety of problems that can cause slow network speeds and they can be difficult to diagnose. A technician should apply a structured process to investigate possible causes.
C. The received signal strength indicator (RSSI) is the signal strength as measured at the receiver, using either decibel units or an index value.
D. Quality of service (QoS) means that switches, access points, and routers are all configured to identify voice over internet protocol (VoIP) data and prioritize it over bursty data.
A network technician troubleshoots a computer on the wired network that is experiencing slow network speeds. Which of the following would NOT be a possible cause for the technician to troubleshoot?
A.Improperly terminated patch cords
B.Improper speed/duplex configuration
C.Another radio source broadcasting at the same frequency
D.External interference on the cable
C. Another radio source broadcasting at the same frequency
Another radio source broadcasting at the same frequency would cause interference and result in slow speeds for wireless devices, but this would not be relevant to a wired network.
Other options
A. Improperly terminated patch cords can cause slow network speeds on a wired network. The technician should substitute the patch cord with a known good cable or verify patch cords using a cable tester.
B. An improper speed/duplex configuration on the switch interface and network interface card (NIC) can cause slow network speeds on a wired network. This should usually be set to auto-negotiate.
D. External interference on the structured cabling can cause slow network speeds on a wired network. A cable tester called a “certifier” can report detailed information about cable interference.
A security technician is installing a doorbell/video entry system for a customer so that the customer can see and communicate with people who come to their home when they aren’t there. What kind of device is the doorbell/video entry system?
A.Zigbee
B.Hub and control system
C.OT
D.Smart device
D. Smart Device
The doorbell/video entry system is a smart device which is a device or appliance that users can configure and monitor over an IoT network.
Other options
A. Zigbee is a wireless technology. While the control system is typically joined to the Wi-Fi network, smart devices may use other wireless technologies, such as Z-Wave or Zigbee, to exchange data via the hub.
B. A hub and control system are each required by IoT devices. The hub facilitates wireless networking while the control system operates the device.
C. An embedded system network is known as an operational technology (OT) network to distinguish it from an IT network.
A web designer is securely uploading files to a web server. What protocol is the designer using to do this?
A.SMB
B.NetBIOS
C.FTPS
D.FTP
D. FTP
The plain File Transfer Protocol (FTP) allows a client to upload files to a web server, but it is unencrypted and poses a high-security risk. FTP-Secure (FTPS) encrypts FTP sessions and is more prevalent than FTP now.
Other options
A. Server Message Block (SMB) is the application protocol underpinning file and printer sharing on Windows networks. SMB usually runs directly over the TCP/445 port.
B. Windows previously used Network Basic Input/Output System (NetBIOS) instead of TCP/IP. NetBIOS allowed computers to address one another by name and establish sessions for other protocols, such as SMB.
C. File Transfer Protocol (FTP) allows a client to upload and download files from a network server. A common use of FTP is uploading files to websites.
A network technician is configuring an email connection that will have a permanent connection to the mail server. What kind of email connection is the technician configuring?
A.SMTP
B.HTML
C.POP3
D.IMAP
D. IMAP
The Internet Message Access Protocol (IMAP) is a mail retrieval protocol that supports permanent connections to a server and connecting multiple clients to the same mailbox simultaneously.
Other options
A. In Simple Mail Transfer Protocol (SMTP), the SMTP server of the sender discovers the IP address of the recipient SMTP server by using the domain name part of the recipient’s email address.
B. HyperText Markup Language (HTML) web pages are plain text files with coded tags describing how to format the document.
C. The Post Office Protocol (POP) is an early example of a mailbox access protocol. POP is generally known as POP3 because the active version of the protocol is version 3. example of a mailbox access protocol. POP is generally known as POP3 because the active version of the protocol is version 3.
An energy company is upgrading its systems across multiple sites. The company would like to control the systems with software that communicates with the current programmable logic controllers (PLCs) and new RTUs. What kind of system is the company upgrading to?
A.OT
B.SCADA
C.Embedded system
D.ICS
B. SCADA
The company is upgrading to a supervisory control and data acquisition (SCADA) system which takes the place of a control server in large-scale, multiple-site ICSs.
Other options
A. An embedded system network is known as an operational technology (OT) network to distinguish it from an IT network.
C. An embedded system is an electronic device that performs a specific, dedicated function. Embedded systems might typically have operated within a closed network.
D. An industrial control system (ICS) provides mechanisms for workflow and process automation. An ICS controls machinery used in critical infrastructures, such as power and water suppliers.
A network technician is troubleshooting an issue where a wireless device only receives an intermittent signal. What could be a possible cause of this? (Select all that apply.)
A. Another radio source is broadcasting at the same frequency.
B. There is Wi-Fi analyzer software running.
C. There is an electromagnetic source nearby.
D. Something is blocking the signal.
A. Another radio source is broadcasting at the same frequency, B. There is WI-Fi analyzer software running and D. Something is blocking the signal
A. If a device is within the supported range but the signal is intermittent, there is likely to be interference from another radio source broadcasting at the same frequency.
C. Interference from a powerful electromagnetic source, such as a motor or a microwave oven, can cause an intermittent wireless signal.
D. Radio waves do not pass easily through metal or dense objects. Construction materials, such as wire mesh, foil-backed plasterboard, concrete, and mirrors, can block or degrade signals.
Other options
B. Wi-Fi analyzer software identifies the signal strength of nearby networks on each channel. It shows the signal strength with values close to zero representing a stronger signal.
A web developer plans out a new website, including the uniform resource locators (URLs) for each page. What are parts of the URL that the web developer will need to consider? (Select all that apply.)
A.File server
B.FQDN
C.Protocol
D.File path
B. FQDN, C. Protocol and D. File Path
B. The developer will need to consider the fully qualified domain name (FQDN) which is not case sensitive. The host location can also be an IP address; an IPv6 address must be in square brackets.
C. The developer will need to consider the protocol which describes the access method and will likely be HyperText Transfer Protocol (HTTP) or HyperText Transfer Protocol Secure (HTTPS).
D. The developer will need to consider the file path, which specifies the directory and file name location of the resource (if required). The file path may or may not be case-sensitive.
Other options
A. In file server-based networks, a central machine provides dedicated file and print services to workstations. Benefits of server-based networks include ease of administration through centralization.
Company employees access the same resources on the internet many times a day. As such, a network administrator configures a solution that forwards traffic to and from the internet and also caches content to improve performance and reduce bandwidth consumption. What solution is the administrator implementing?
A.NAT
B.Proxy server
C.UTM
D.Load balancer
B. Proxy server
A proxy server takes a whole HTTP request from a client, checks it, then forwards it to and from the destination server on the internet. It also caches content to improve performance.
Other options
A. In a port-based or overloaded network address translation (NAT), a NAT device translates between the private IP addresses used on the LAN and the public IP address on the router’s WAN interface.
C. A unified threat management (UTM) appliance enforces a variety of security policies and controls, combining the work of multiple security functions.
D. A load balancer distributes client requests across server nodes in a farm or pool and can deploy in any situation where multiple servers are providing the same function.
A network administrator configures an authentication, authorization, and accounting (AAA) server. Which component in the AAA server setup does not store authentication credentials, but acts as a transit to forward data between devices?
A.Supplicant
B.NAP
C.RADIUS
D.AAA
B. NAP
The network access point (NAP) or network access server (NAS) are appliances, such as switches, access points, and VPN gateways. These do not store authentication credentials but simply act as a transit to forward this data between the AAA server and the supplicant.
Other options
A. The supplicant is a component of the authentication, authorization, and accounting server and is the device requesting access, such as a user’s PC or laptop.
C. Remote Authentication Dial-in User Service (RADIUS) is a protocol that manages remote and wireless authentication infrastructures and implements AAA.
D. In an authentication, authorization, and accounting (AAA) configuration, the AAA server is the authentication server positioned within the local network.
A company uses a database that a developer wrote in-house. Since the database is not supported and the developer has left the organization, what is the database considered to be?
A.BYOD
B.Legacy system
C.Embedded system
D.UTM
B. Legacy system
When a vendor no longer supports a system, it is a legacy system. This might be because the vendor has gone out of business or formally deprecated the use of the product.
Other options
A. Bring your own device (BYOD) is a provisioning model that allows employees to use personal mobile devices to access corporate systems and data.
C. An embedded system is an electronic device that performs a specific, dedicated function. Embedded systems represent a risk in terms of maintenance and troubleshooting as well as security because they tend to require more specialized knowledge than modern, off-the-shelf computing systems.
D. A Unified Threat Management (UTM) appliance is one that enforces a variety of security policies and controls, combining the work of multiple security functions.
