15 Application LAyer

Which three protocols or standards are used at the application layer of the TCP/IP model? (Choose three.)

Topic 15.1.0 - HTTP, MPEG, and GIF operate at the application layer of the TCP/IP model. TCP and UDP operate at the transport layer. IP operates at the internet layer.​

Which protocol uses encryption?

Topic 15.1.0 - HTTPS uses Secure Socket Layer (SSL) to encrypt traffic accessed from a web server.

What are two characteristics of the application layer of the TCP/IP model? (Choose two.)

Topic 15.1.0 - The application layer of the TCP/IP model is the layer that is closest to the end user, providing the interface between the applications. It is responsible for formatting, compressing, and encrypting data, and is used to create and maintain dialog between source and destination applications.

An author is uploading one chapter document from a personal computer to a file server of a book publisher. What role is the personal computer assuming in this network model?

Topic 15.2.0 - In the client/server network model, a network device assumes the role of server in order to provide a particular service such as file transfer and storage. The device requesting the service assumes the role of client. In the client/server network model, a dedicated server does not have to be used, but if one is present, the network model being used is the client/server model. In contrast, the peer-to-peer network model does not have a dedicated server.

What message type is used by an HTTP client to request data from a web server?

Topic 15.3.0 - HTTP clients send GET messages to request data from web servers.

When retrieving email messages, which protocol allows for easy, centralized storage and backup of emails that would be desirable for a small- to medium-sized business?

Topic 15.3.0 - IMAP is preferred for small-to medium-sized businesses as IMAP allows centralized storage and backup of emails, with copies of the emails being forwarded to clients. POP delivers the emails to the clients and deletes them on the email server. SMTP is used to send emails and not to receive them. HTTPS is not used for secure web browsing.

Which protocol can be used to transfer messages from an email server to an email client?

Topic 15.3.0 - SMTP is used to send mail from the client to the server but POP3 is used to download mail from the server to the client. HTTP and SNMP are protocols that are unrelated to email.

On a home network, which device is most likely to provide dynamic IPv4 addressing to clients on the home network?

Topic 15.4.0 - On a home network, a home router usually serves as the DHCP server. The home router is responsible for dynamically assigning IPv4 addresses to clients on the home network. ISPs also use DHCP, but it usually assigns an IPv4 address to the Internet interface of the home router, not the clients on the home network. In businesses, it is common to have a file or other dedicated server provide DHCP services to the network. Finally, a DNS server is responsible for finding the IP address for a URL, not for providing dynamic addressing to network clients.

Why is DHCP for IPv4 preferred for use on large networks?

Topic 15.4.0 - Static IPv4 address assignment requires personnel to configure each network host with addresses manually. Large networks can change frequently and have many more hosts to configure than do small networks. DHCP provides a much more efficient means of configuring and managing IPv4 addresses on large networks than does static address assignment.

A wireless host needs to request an IPv4 address. What protocol would be used to process the request?

Topic 15.4.0 - The DHCP protocol is used to request, issue, and manage IP addressing information. CSMA/CD is the access method used with wired Ethernet. ICMP is used to test connectivity. SNMP is used with network management and FTP is used for file transfer.

What part of the URL, http://www.cisco.com/index.html, represents the top-level DNS domain?

Topic 15.4.0 - The components of the URL http://www.cisco.com/index.html are as follows: http = protocol www = part of the server name cisco = part of the domain name index = file name com = the top-level domain

Which two tasks can be performed by a local DNS server? (Choose two.)om a server.

Topic 15.4.0 - Two important functions of DNS are to (1) provide IP addresses for domain names such as www.cisco.com, and (2) forward requests that cannot be resolved to other servers in order to provide domain name to IP address translation. DHCP provides IP addressing information to local devices. A file transfer protocol such as FTP, SFTP, or TFTP provides file sharing services. IMAP or POP can be used to retrieve an email message from a server.

Which statement is true about FTP

Topic 15.5.0 - FTP is a client/server protocol. FTP requires two connections between the client and the server and uses TCP to provide reliable connections. With FTP, data transfer can happen in either direction. The client can download (pull) data from the server or upload (push) data to the server.

Which application layer protocol is used to provide file-sharing and print services to Microsoft applications?

Topic 15.5.0 - SMB is used in Microsoft networking for file-sharing and print services. The Linux operating system provides a method of sharing resources with Microsoft networks by using a version of SMB called SAMBA.

Topic 15.1.0 - End users use applications to interact with and use the network. The application layer of the TCP/IP model is closest to the end user. Application layer protocols are used to communicate and exchange messages with other network devices and applications. The layers of the TCP/IP model are from top to bottom (memory aid - ATIN): application, transport, internet, network access

Which TCP/IP model layer is closest to the end user?