CompTIA A+ : Networking

A user is configuring an email client application and decides to use a TCP/IP suite protocol that stores all messages on the email server so that they can be synchronized across a laptop, a smartphone, and a web email client. In addition, this protocol stores the email messages on the email server until the user explicitly deletes them. What TCP/IP port number will the client application typically access while using this protocol to contact the email server?

143 The TCP/IP suite protocol that stores email messages on a server so that they can be synchronized across multiple devices is Internet Message Access Protocol (IMAP). IMAP typically uses port 143. FTP uses port 21. HTTP uses port 80. POP3 uses port 110.

Which port must be opened on the firewall of a Windows system so that a Remote Desktop connection can be established?

3389 A Windows system firewall must be configured to allow Remote Desktop traffic through. This is done by opening TCP port 3389 (by default). This port is opened automatically on the Remote Desktop host when remote connections are enabled. SSH uses port 22, Telnet uses port 23, and Network Time Protocol uses port 123.

While working on a Windows workstation, you enable Remote Desktop. What port MUST be open on the server's firewall to allow remote clients to access the desktop through Remote Desktop?

3389 Remote Desk Protocol (RDP) runs on port 3389 by default. POP3 uses port 110. LDAP uses port 389. NTP uses port 123.

While making an online bank transaction, a customer checks to see that the web browser is displaying a lock icon that indicates that an encrypted TCP/IP suite protocol is being used. What TCP/IP port number does this protocol typically use when the browser encrypts its communications with the bank's web server?

443 The TCP/IP suite protocol web browsers use for encrypted communications is HTTPS. HTTPS typically uses port 443. HTTP uses port 80. SMTP uses port 25. IMAP uses port 143.

You've just installed the DNS service on a Windows server. What port must be opened on the server's firewall to allow clients to access the service?

53 The DNS service runs on port 53 by default. POP3 uses port 110. IMAP uses port 143. NTP uses port 123.

A technician has configured a client computer's network interface with server addresses to which the client will send requests for translating fully qualified domain names (FQDNs) to IP addresses and IP addresses to FQDNs. What TCP/IP suite protocol is used by the client to perform the request and also used by a server to respond to those requests?

Domain Name System (DNS) DNS associates readily recognizable domain names to numerical IP addresses. DHCP is used by clients to request an IP address and by a server to offer an IP address. SMB is used for shared access to files and miscellaneous communications between hosts on a network. This protocol also provides an authenticated inter-process communication mechanism. SSH allows network services to communicate securely over an unsecure network (for example, secure remote login to computer systems by users).

You are assembling components in a network rack and need a device that connects three network segments. What device will meet your networking needs?

Ethernet router An Ethernet router is a device that connects two or more network segments or subnets. This would meet your networking needs. An Ethernet switch lets you connect multiple devices to the same network segment, but does not connect the network segments. A wireless controller monitors and manages wireless access points in a wireless network architecture. An Ethernet patch panel provides an easy way to connect devices and accommodate different types of cabling, such as twisted-pair and fiber optic cables.

When using TCP, two hosts first establish a connection through a three-way handshake. From the drag section, drag the three valid steps in the three-way handshake process to the right in the appropriate order in the drop section. Drag The first host sends a SYN packet asking to create a new session. The first host sends a SYN-ACK packet asking to create a new session. The receiving host replies with an ACK packet that the session can be created. The receiving host replies with a SYN-ACK packet acknowledging that the session can be created. The first host replies with the ACK packet, which then opens the session. The first host replies with a SYN packet, which then opens the session. Drop First step Second step Third step

First step The first host sends a SYN packet asking to create a new session. Second step The receiving host replies with a SYN-ACK packet acknowledging that the session can be created. Third step The first host replies with the ACK packet, which then opens the session. When using TCP, two hosts first establish a connection through a three-way handshake. This handshake process is established in the following order: The first host sends a SYN packet asking to create a new session. The receiving host replies with a SYN-ACK packet acknowledging that the session can be created. The first host replies with the ACK packet, which then opens the session. All the rest of the listed steps on the left are invalid.

What protocol is used by an email client to retrieve messages from an email server, giving users the option to keep mail messages on the server?

IMAP IMAP allows a mail server to keep a copy of a user's messages on the server after they're downloaded to the mail client. SMTP allows a user to send email to a server, but it can't be used to retrieve messages from the server. A POP3 server is also used by a mail client to retrieve messages from a mail server, but it requires that the messages be deleted from the server after they've been downloaded. NTP synchronizes all network computer clocks.

What 2 locations will contribute the greatest amount of interference to a wireless access point?

Near cordless phones / Near backup generators Other wireless transmitting devices (such as cordless phones or microwaves) and generators cause interference for wireless access points. In general, place access points high up to avoid the interference problems caused by going through building foundations. DHCP servers provide IP information for clients and do not cause interference. Exterior walls do not contribute to interference with a wireless access point.

What protocol do email clients use to download messages from a remote mail server?

POP3 POP3 is part of the IP protocol suite and is used to retrieve email from a remote server to a local client over a network connection. SNMP monitors network traffic. SMTP is an IP protocol for sending email. FTP is used to transfer files.

What three things does a packet header contain?

Receiver / Sender / Data chunk order

What device is responsible for forwarding traffic in between networks?

Router Routers are used to connect multiple networks together. When sending data in between networks, the router is responsible for forwarding the data to the proper network. Switches are used to connect multiple computers inside of a network together. They do not forward data to other networks. Access points are used to connect wireless network hosts. They do not forward data to other networks. The network interface (NIC) converts the digital data into a signal that can be transmitted along the transmission medium. They do not forward data to other networks.

You've used your Windows workstation to map a drive to a shared folder on a Windows server. Which protocol was used to access the share?

SMB Server Message Block (SMB) is used by Windows systems to access shared resources over the network. Lightweight Directory Access Protocol (LDAP) is used to access information stored in a server's directory service. Remote Desktop Protocol (RDP) is used to access remote systems' desktops. Secure File Transfer Protocol (SFTP) is used to securely transfer files between hosts.

Listen to exam instructions You are a software developer, and you're creating a multimedia streaming application. Data will be streamed from your streaming server to clients over IP networks. Which transport protocol should your application use to send data between the clients and the server?

UDP User Datagram Protocol (UDP) can be used with IP to create unacknowledged connections between the server application and its clients. Because the packets are sent unacknowledged, latency is dramatically reduced, providing better streaming performance. Transmission Control Protocol (TCP) uses acknowledged connections, which introduce considerable latency and reduce streaming performance. Simple Network Management Protocol (SNMP) is used to monitor and manage network devices. Internet Control Message Protocol (ICMP) is what sends and receives error messages on an IP network.

An administrator configures a server to run the TCP/IP suite protocol that allows users to download files contained in specific directories on the server and also protects access to those files by requiring user authentication. What TCP/IP port number allow this protocol to work properly? (Select two.)

20 / 21 The TCP/IP suite protocol that allows users to download files from a server and protects access to the files by requiring user authentication to access specific directories on the server is FTP. FTP uses ports 20 and 21. DNS uses port 53. HTTP uses port 80. POP3 email clients use port 110.

To assist a user, a help desk technician is able to take advantage of a Windows proprietary network protocol that allows the technician to open a graphical interface to connect with the user's Windows computer. What TCP/IP port number is the default port used by this protocol?

3389 The Windows proprietary network protocol that allows the technician to open a graphical interface to connect with the user's Windows computer is Remote Desktop Protocol (RDP). By default, RDP uses port 3389. HTTP uses port 80. HTTPS uses port 443. IMAP email clients use port 143.

You want to implement name resolution on the Linux workstations in your company. Which protocol should you use to do this?

DNS You can use DNS name resolution for Linux workstations (as well as for most other operating systems). NetBIOS name resolution (LMHOSTS files or WINS) is typically used on Windows-based networks. The LMHOSTS file is a local text file that maps Internet Protocol (IP) addresses to the NetBIOS names of remote servers you communicate with over the TCP/IP protocol. A WINS server address is only needed if you have older Windows clients on multiple networks. Network Time Protocol (NTP) is a means of transmitting time signals over a computer network. Simple Mail Transfer Protocol (SMTP) is used to route electronic mail through the internetwork. Email applications provide the interface to communicate with SMTP or mail servers.

A technician has configured a client computer's network interface to request an IP address. What TCP/IP suite protocol does the client computer use to perform the request and receive an IP address from a server?

Dynamic Host Configuration Protocol (DHCP) Clients use DHCP to request an IP address, and servers use DHCP to provide an IP address. SNMP is used to collect information about managed devices on IP networks. SNMP can also modify settings to change a network device's behavior. LDAP is used to access and maintain distributed directory information services. DNS associates readily recognizable domain names to numerical IP addresses.

You are in the process of setting up an Ethernet network for a new building at your company's headquarters. You need to connect the wires from the different Ethernet office wall plates to your network rack. What component on the network rack should you use to connect the wires from the office wall plates?

Ethernet patch panel

You want to allow your users to download files from a server running the IP protocol. You also want to protect access to the files by requiring user authentication to access specific directories on the server. What IP protocol should you implement to provide this capability?

FTP You should implement File Transfer Protocol (FTP). It enables file transfers and supports user authentication. Simple Network Management Protocol (SNMP) is used to remotely monitor and manage network devices and hosts. Simple Mail Transfer Protocol (SMTP) is used to transfer email message from email clients to email servers. Trivial File Transfer Protocol (TFTP) also enables file transfer but does not support user authentication. Lightweight Directory Access Protocol (LDAP) allows access to information about network resources stored in a directory server. Secure Shell (SSH) allows users to securely access a remote computer system's console prompt.

What protocol are used on the internet to transmit web pages from web servers to web browsers running on client workstations? (Select two.)

HTTPS / HTTP HyperText Transfer Protocol (HTTP) and HTTPS (HTTP Secure) are used by web servers and browsers to transmit web pages over the internet. This is often confused with HTML, or HyperText Markup Language, which is the markup language used to create web content. XML is also a markup language. SMTP is used to route electronic mail through the internetwork. Email applications provide the interface to communicate with SMTP or mail servers. Network News Transfer Protocol, or NNTP, is an internet application protocol used primarily for reading and posting Usenet articles.

What protocol is often combined with TCP to send data across the internet?

IP TCP is most often combined with Internet Protocol (IP) to send data across the internet. IP is responsible for determining how to deliver the data between two hosts, and TCP is responsible for the segmenting and sequencing of the data packets. User Datagram Protocol (UDP) is also used alongside Internet Protocol as an alternative to TCP to send data across a network. UDP is a connectionless protocol. Internet Control Message Protocol (ICMP) is an Internet layer protocol used by network devices, including routers, to send error messages and operational information. For example, ICMP may state that a service is unavailable or a host couldn't be reached. File Transfer Protocol (FTP) is an Application layer protocol used to transfer computer files between hosts.

What protocol is non-routable and requires another protocol to enable internetwork communications?

NetBIOS NetBIOS is a non-routable protocol. It is often combined with IPX or IP to enable internetwork communications. NetBIOS was used in earlier versions of Windows but is rarely used today because nearly every operating system supports IP. IP is the protocol suite used on the internet and is supported by all major operating systems. IPX is the protocol suite used by legacy NetWare servers. AppleTalk over IP is the protocol used to allow older AppleTalk computers to use IP for internetwork communication.

What are the standards called that define how data is formatted and transmitted over a network?

Networking protocols Networking protocols define how the data is formatted and transmitted. If devices are not using the same protocol then they will be unable to communicate. The transmission medium refers to how devices are connected together. Examples include twisted pair cabling, fiber optics, or wireless radio signals. The network interface (NIC) converts the digital data into a signal that can be transmitted along the transmission medium. The network ID is the portion of the IPv4 address that defines the network address. Every host on the network will have the same network ID.

A user is configuring an email client application and plans to use a standard TCP/IP suite protocol to retrieve email messages from an email server. What two protocols can be used to retrieve email messages?

Post Office Protocol (POP3) / Internet Message Access Protocol (IMAP) Both POP3 and IMAP can be used to retrieve email messages from an email server. While SMTP is used to send and retrieve email messages between email servers, client email applications typically use SMTP to send email messages to an email server. SNMP is used to collect information about managed devices on IP networks. SNMP also modifies settings to change network devices' behavior. LDAP is used to access and maintain distributed directory information services.

You want to connect your internal network to an external network in order to provide internet access to your employees. What network components is designed to make this type of connection?

Router A router is an advanced networking device that connects two networks together. When network traffic needs to leave the internal network, it is always sent to the router and then forwarded on to its destination. All external traffic flows through a router. A hub or switch is used to connect client devices together using Ethernet cables within a single network. However, a hub broadcasts data packets to all connected client devices, while a switch sends data packets to only the intended recipient. PoE is a standard that allows power to be provided to connected devices over an Ethernet cable.

What protocol is used to send email messages from a mail client to a mail server?

SMTP SMTP sends email from a mail client to a mail server. FTP provides a generic method for transferring files. SNMP is used in network management systems to monitor network-attached devices for conditions that warrant administrative attention. POP3 and IMAP are both email protocols used by mail clients to retrieve email from a mail server. However, they can't be used to send mail from the client to the server.

Match each port number on the left with its associated protocol on the right : (Port Numbers) 80 443 143 22 445 427 548 (Protocols) Secure Shell (SSH) Apple Filing Protocol (AFP) HyperText Transfer Protocol Secure (HTTPS) HyperText Transfer Protocol (HTTP) Server Message Block (SMB/CIFS) directly over TCP Service Location Protocol (SLP) Internet Message Access Protocol (IMAP)

Secure Shell (SSH) 22 Apple Filing Protocol (AFP) 548 HyperText Transfer Protocol Secure (HTTPS) 443 HyperText Transfer Protocol (HTTP) 80 Server Message Block (SMB/CIFS) directly over TCP 445 Service Location Protocol (SLP) 427 Internet Message Access Protocol (IMAP) 143 The default ports match with the following protocols: Port 22: Secure Shell (SSH) Port 80: HyperText Transfer Protocol (HTTP) Port 443: HyperText Transfer Protocol Secure (HTTPS) Port 445: Server Message Block (SMB/CIFS) directly over TCP Port 143: Internet Message Access Protocol (IMAP) Port 427: Service Location Protocol (SLP) Port 548: Apple Filing Protocol (AFP)

Listen to exam instructions A company has built a video streaming service that supplies training videos. Quickly transmitting video data to customers is more important than guaranteed delivery. What Transport layer IP suite protocols is MOST likely used for this service?

User Datagram Protocol (UDP) User Datagram Protocol (UDP) is a Transport layer protocol that uses a simple connectionless communication model with a minimal protocol mechanism. This makes it suitable for streaming video or sound. Guaranteed data delivery is not as important as fast transmissions. Transport Layer Protocol (TCP) is a Transport layer protocol that provides reliable, ordered, and error-checked data delivery. Guaranteed data delivery is more important than fast transmissions. Internet Control Message Protocol (ICMP) is an Internet layer protocol used by network devices, including routers, to send error messages and operational information. For example, ICMP may state that a service is unavailable or a host couldn't be reached. File Transfer Protocol (FTP) is an Application layer protocol used to transfer computer files between hosts.

The router below provides several ports for connecting two or more network segments or subnets. The port circled in red is a small form-factor pluggable (SFP) connector. Which type of network can connect to this port? v

WAN A wide area network (WAN) is connected to the router using a small form-factor pluggable (SFP) connector. A local area network (LAN) is connected to the router using an RJ45 cable. A wireless network uses a wireless controller on the network rack to monitor and manages wireless access points. DHCP (Dynamic Host Configuration Protocol) is a network management protocol used to automate the process of configuring devices on IP networks. It is not a type of network.