Review Which layer of the TCP or IP model determines the best path through the network?
Mẹo Hướng dẫn Which layer of the TCP or IP model determines the best path through the network? Mới Nhất
Hoàng Quang Hưng đang tìm kiếm từ khóa Which layer of the TCP or IP model determines the best path through the network? được Cập Nhật vào lúc : 2022-12-03 21:32:04 . Với phương châm chia sẻ Kinh Nghiệm về trong nội dung bài viết một cách Chi Tiết Mới Nhất. Nếu sau khi tham khảo tài liệu vẫn ko hiểu thì hoàn toàn có thể lại Comment ở cuối bài để Mình lý giải và hướng dẫn lại nha.The OSI model describes an idealized network communications with a family of protocols. TCP/IP does not correspond to this model directly. TCP/IP either combines several OSI layers into a single layer, or does not use certain layers all. The following table shows the layers of the Solaris implementation of TCP/IP. The table lists the layers from the topmost layer (application) to the lowest (physical network).
Nội dung chính Show- Physical Network LayerData-Link LayerInternet LayerTransport LayerApplication LayerWhat layer determines the best path through the network?What layer of the TCP IP reference model is responsible for selecting the best path through the network from source to destination?Which is the most important layer of the TCP IP and why?Which layer of the TCP IP model provides a route to?
OSI Ref. Layer No.
OSI Layer Equivalent
TCP/IP Layer
TCP/IP Protocol Examples
5,6,7
Application, session, presentation
Application
NFS, NIS+, DNS, telnet, ftp, rlogin, rsh, rcp, RIP, RDISC, SNMP, and others
4
Transport
Transport
TCP, UDP
3
Network
Internet
IP, ARP, ICMP
2
Data link
Data link
PPP, IEEE 802.2
1
Physical
Physical network
Ethernet (IEEE 802.3) Token Ring, RS-232, others
The table shows the TCP/IP protocol layers. Also shown are the OSI Model equivalents with examples of the protocols that are available each level of the TCP/IP protocol stack. Each host that is involved in a communication transaction runs a unique implementation of the protocol stack.
Physical Network Layer
The physical network layer specifies the characteristics of the hardware to be used for the network. For example, physical network layer specifies the physical characteristics of the communications truyền thông. The physical layer of TCP/IP describes hardware standards such as IEEE 802.3, the specification for Ethernet network truyền thông, and RS-232, the specification for standard pin connectors.
Data-Link Layer
The data-link layer identifies the network protocol type of the packet, in this instance TCP/IP. The data-link layer also provides error control and “framing.” Examples of data-link layer protocols are Ethernet IEEE 802.2 framing and Point-to-Point Protocol (PPP) framing.
Internet Layer
This layer, also known as the network layer, accepts and delivers packets for the network. This layer includes the powerful Internet Protocol (IP), the Address Resolution Protocol (ARP), and the Internet Control Message Protocol (ICMP).
The IP protocol and its associated routing protocols are possibly the most significant of the entire TCP/IP suite. IP is responsible for the following:
Host-to-host communications – IP determines the path a packet must take, based on the receiving host's IP address.
Packet formatting – IP assembles packets into units that are known as IP datagrams. Datagrams are fully described in Internet Layer.
Fragmentation – If a packet is too large for transmission over the network truyền thông, IP on the sending host breaks the packet into smaller fragments. IP on the receiving host then reconstructs the fragments into the original packet.
Previous releases of the Solaris operating environment implement version 4 of the Internet Protocol, which is abbreviated as IPv4. However, because of the rapid growth of the Internet, a new Internet Protocol was created. The new protocol increases address space. This new version, known as version 6, is abbreviated as IPv6. The Solaris operating environment supports both versions, which are described in this book. To avoid confusion when addressing the Internet Protocol, one of the following conventions is used:
When the term IP is used in a description, the description applies to both IPv4 and IPv6.
When the term IPv4 is used in a description, the description applies only to IPv4.
When the term IPv6 is used in a description, the description applies only to IPv6.
The Address Resolution Protocol (ARP) conceptually exists between the data-link and Internet layers. ARP assists IP in directing datagrams to the appropriate receiving host by mapping Ethernet addresses (48 bits long) to known IP addresses (32 bits long).
ICMP ProtocolInternet Control Message Protocol (ICMP) detects and reports network error conditions. ICMP reports on the following:
Dropped packets – Packets that arrive too fast to be processed
Connectivity failure – A destination host that cannot be reached)
Redirection – Redirecting a sending host to use another router
The ping Command contains more information on the operating system commands that use ICMP for error detection.
Transport Layer
The TCP/IP transport layer protocols ensure that packets arrive in sequence and without error, by swapping acknowledgments of data reception, and retransmitting lost packets. This type of communication is known as “end-to-end.” Transport layer protocols this level are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).
TCP ProtocolTCP enables applications to communicate with each other as though connected by a physical circuit. TCP sends data in a form that appears to be transmitted in a character-by-character fashion, rather than as discrete packets. This transmission consists of a starting point, which opens the connection, the entire transmission in byte order, and an ending point, which closes the connection.
TCP attaches a header onto the transmitted data. This header contains a large number of parameters that help processes on the sending machine connect to peer processes on the receiving machine.
TCP confirms that a packet has reached its destination by establishing an end-to-end connection between sending and receiving hosts. TCP is therefore considered a “reliable, connection-oriented” protocol.
UDP ProtocolUDP, the other transport layer protocol, provides datagram delivery service. UDP does not verify connections between receiving and sending hosts. Because UDP eliminates the processes of establishing and verifying connections, applications that send small amounts of data use UDP rather than TCP.
Application Layer
The application layer defines standard Internet services and network applications that anyone can use. These services work with the transport layer to send and receive data. Many application layer protocols exist. The following list shows examples of application layer protocols:
Standard TCP/IP services such as the ftp, tftp, and telnet commands
UNIX “r” commands, such as rlogin and rsh
Name services, such as NIS+ and domain name system (DNS)
File services, such as the NFS service
Simple Network Management Protocol (SNMP), which enables network management
RIP and RDISC routing protocols
FTP and Anonymous FTP – The File Transfer Protocol (FTP) transfers files to and from a remote network. The protocol includes the ftp command (local machine) and the in.ftpd daemon (remote machine). FTP enables a user to specify the name of the remote host and file transfer command options on the local host's command line. The in.ftpd daemon on the remote host then handles the requests from the local host. Unlike rcp, ftp works even when the remote computer does not run a UNIX-based operating system. A user must log in to the remote computer to make an ftp connection unless the remote computer has been configured to allow anonymous FTP.
You can now obtain an enormous amount of materials from anonymous FTP servers that are connected to the Internet. Universities and other institutions set up these servers to offer software, research papers, and other information to the public domain. When you log in to this type of server, you use the login name anonymous, hence the term “anonymous FTP servers.”
Using anonymous FTP and setting up anonymous FTP servers is outside the scope of this manual. However, many books, such as The Whole Internet User's Guide & Catalog, discuss anonymous FTP in detail. Instructions for using FTP to reach standard machines are in System Administration Guide: Resource Management and Network Services. The ftp(1) man page describes all ftp command options that are invoked through the command interpreter. The ftpd(1M) man page describes the services that are provided by the daemon in.ftpd.
Telnet – The Telnet protocol enables terminals and terminal-oriented processes to communicate on a network that runs TCP/IP. This protocol is implemented as the program telnet (on local machines) and the daemon in.telnetd (on remote machines). Telnet provides a user interface through which two hosts can communicate on a character-by-character or line-by-line basis. The application includes a set of commands that are fully documented in the telnet(1) man page.
TFTP – The Trivial File Transfer Protocol (tftp) provides functions that are similar to ftp, but the protocol does not establish ftp's interactive connection. As a result, users cannot list the contents of a directory or change directories. A user must know the full name of the file to be copied. The telnet(1) man page describes the tftp command set.
The UNIX “r” commands enable users to issue commands on their local machines that run on the remote host. These commands include the following:
Instructions for using these commands are in rcp(1), rlogin(1), and rsh(1) man pages.
Name ServicesThe Solaris operating environment provides the following naming services:
DNS – The domain name system (DNS) is the naming service provided by the Internet for TCP/IP networks. DNS provides host names to the IP address service. DNS also serves as a database for mail administration. For a complete description of this service, see System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP). See also the resolver(3RESOLV) man page.
/etc files – The original host-based UNIX™ naming system was developed for standalone UNIX™ machines and then adapted for network use. Many old UNIX™ operating systems and machines still use this system, but it is not well suited for large complex networks.
NIS – Network Information Service (NIS) was developed independently of DNS and has a slightly different focus. Whereas DNS focuses on making communication simpler by using machine names instead of numerical IP addresses, NIS focuses on making network administration more manageable by providing centralized control over a variety of network information. NIS stores information about machine names and addresses, users, the network itself, and network services. NIS namespace information is stored in NIS maps. For more information on NIS Architecture and NIS Administration, see System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP).
NIS+ – NIS+ provides centralized control over network administration services, such as mapping host names to IP and Ethernet addresses, verifying passwords, and so on. See System Administration Guide: Naming and Directory Services (FNS and NIS+).
FNS – Federated Naming Service (FNS), supports the use of different autonomous naming systems in a single Solaris operating environment. FNS allows you to use a single, simple naming system interface for all of the different name services on your network. FNS conforms to the X/Open federated naming (XFN) specification. FNS is not a replacement for NIS+, NIS, DNS, or /etc files. Rather, FNS is implemented on top of these services and allows you to use a set of common names with desktop applications. See System Administration Guide: Naming and Directory Services (FNS and NIS+).
The Solaris operating environment supports LDAP (Lightweight Directory Access Protocol) in conjunction with the iPlanet Directory Server 5.x, as well as other LDAP Directory Servers. The distinction between a Naming Service and a Directory Service is in the differing extent of functionality. A directory service provides the same functionality of a naming service, but provides additional functionalities as well. See System Administration Guide: Naming and Directory Services (DNS, NIS, and LDAP).
File ServicesThe NFS application layer protocol provides file services for the Solaris operating environment. You can find complete information about the NFS service in System Administration Guide: Resource Management and Network Services.
Network AdministrationThe Simple Network Management Protocol (SNMP) enables you to view the layout of your network and view the status of key machines. SNMP also enables you to obtain complex network statistics from software that is based on a graphical user interface. Many companies offer network management packages that implement SNMP. SunNet ManagerTM software is an example.
Routing ProtocolsThe Routing Information Protocol (RIP) and the Router Discovery Protocol (RDISC) are two routing protocols for TCP/IP networks. They are described in Routing Protocols.
What layer determines the best path through the network?
The Layer 3, or Network Layer, is responsible for finding the right path for the data packet to reach its destination based on Logical Addresses (means addresses not really present on the network node).What layer of the TCP IP reference model is responsible for selecting the best path through the network from source to destination?
The network layer is responsible for routing the data via the best physical path based on a range of factors including network characteristics, best available path, traffic controls, congestion of data packets, and priority of service, among others.Which is the most important layer of the TCP IP and why?
At the top of the TCP/IP protocol architecture is the Application Layer. This layer includes all processes that use the Transport Layer protocols to deliver data. There are many applications protocols.Which layer of the TCP IP model provides a route to?
c. In TCP/IP model, there are mainly four layers: application, network access, internet, and transport. Out of these four layers, the Internet layers route the message between the sender and receiver in an internetwork, that is, the internet layer performs the routing of the messages and it is the correct answer. Tải thêm tài liệu liên quan đến nội dung bài viết Which layer of the TCP or IP model determines the best path through the network? OSI model
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