The frame header includes a cyclic redundancy check (CRC) field that checks for errors as the frame travels over the network media. The TCP/IP protocol stack describes a different model. Which is a function of the Logical Link Control (LLC) sublayer? Logical topologies refer to how a network transfers data between devices. Sequence numbers are fields in TCP headers. The frame header includes a cyclical redundancy check (CRC) field that checks for errors as the frame travels over the network media. CCNA HUB Articles and Labs will help you build a solid foundation in Network, Linux, and Wordpress. Once wrapped, it becomes frame. Ports and cables are placed at the physical layer of the OSI model. These protocols attach a third header and a footer to “frame” the datagram. IP encapsulates the transport layer segment by adding an IP header which is used to deliver the packet, which is examined by Layer 3 devices (i.e., routers and Layer 3 switches), to reach the destination host. Encapsulation type is based on Technology being used: 1. Ethernet Protocol will be called for framing if the Network device uses UTP copper RJ45 cables. hence packeting is network layer’s function. address. It provides media access control and performs error detection. IP will encapsulate the TCP segments into IP packets. Re-encapsulates the packet into a new frame 5. Answer: packets, network layer works with data with packets as every layer has its own functionalities. The encoding of a MAC address on a NIC places it at that layer. Data that is transmitted over the network can only flow in one direction. 13. 13. re-encapsulates the packet into a new frame, forwards the new frame onto the network medium, the virtually unlimited availability of IPv6 addresses, the development of half-duplex switch operation. Link and Physical Layer: Ethernet CCNA 1 has been know as ITN. Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary? Explanation: Routers are responsible for encapsulating a frame with a proper format for the physical network media the routers connect. Once a match is found, the router encapsulates the IP packet into the layer 2 frame of the outgoing or exit interface, and the packet is then forwarded toward its destination. * It provides media access control and performs error detection. Data that is transmitted over the network flows in both directions at the same time. The above figure shows how an AP encapsulates and de-encapsulates different types of Ethernet frames. Data that is transmitted over the network flows in one direction to many different destinations simultaneously. IP addresses are used at the network layer, and TCP and UDP port numbers are used at the transport layer. The data-link protocol will encapsulate the packets into frames … 6. data preamble (payload) CRC. It is important to be familiar with the structure of the IP packet. Then the data-link layer passes the frame to the physical layer. The ISOC promotes the open development, evolution, and use of the Internet throughout the world. Explanation: The data link layer of the OSI model is divided into two sublayers: the Media Access Control (MAC) sublayer and the Logical Link Control (LLC) sublayer. * It monitors the Layer 2 communication by building a MAC address table. In network layer, segments are divided into fragments known as packets which contain the segment, and an IP header basically includes IP address of the source and destination. dest. At last, the packets are encapsulated in frames. Specifically the data link layer performs two basic services: Path determination is a service provided at Layer 3. Genesis Sample Theme - Genesis Framework by StudioPress - WordPress - Log in, Understanding Packet Flow Across the Network Part1, Understanding Packet Flow Across the Network Part2. This website uses cookies. The most significant protocol at layer 3 (also called the network layer) is the Internet Protocol, or IP. Physical topologies are concerned with how a network transfers frames. Data-link layer protocols, such as PPP, format the IP datagram into a frame. The Layer 3 switch encapsulates IP packets into Layer 2 packets, to send the IP packets on the network. 2. Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media? What method is used to manage contention-based access on a wireless network? 10. MAC address. (A Layer 2 packet is also called a MAC layer packet or an Ethernet frame.) The logical topology is always the same as the physical topology. It determines the path to forward packets. Based on Media used, Data link Layer encapsulates IP Packets into HDLC, PPP, Frame Relay, or Ethernet frames, and since Data-Link Layer deals straight with the physical layer that might be different technology on each Hop, Data-Link Layer must use different types of protocols (Or be able to speak each cable language) to reframe/repackage IP packets across different types of cables while the IP packets are being routed from device to device. Router will de-encapsulate the frame in packet to find out the Layer 3 destination address. Ethernet frames are identified at the data link layer by their MAC addresses, which are unique to each NIC. Introduction to Networks (version 6.00) – ITN Chapter 4 Exam Beta Answers 2018 100% Cisco CCNA 1 ITN v6.0 chapter 4 exam beta answers Routing and Switching (R&S) Introduction to Networks (ITN) (Version 6.00) collection year 2017, 2018 and 2019 Full 100%. 1. On a PC, this is most likely either ethernet or Wi-Fi, but it can be something else like PPP. What identifier is used at the data link layer to uniquely identify an Ethernet device? Re-encapsulates the packet into a new frame Explanation: Ethernet frames are identified at the data link layer by their MAC addresses, which are unique to each NIC. By continuing to browse the site, you are agreeing to our, Understanding Data Link Layer Encapsulation, "Understanding Data Link Layer Encapsulation". At the Data Link layer, the frame structure is nearly identical for all speeds of Ethernet. PPP or HDLC Protocol will be called for framing when serial leased line cabling through Telco PSTN is used. 5. sending adapter encapsulates IP datagram (or other network layer protocol packet) in Ethernet frame. Explanation: Encapsulation is a function of the data link layer. 14. The Ethernet frame has many fields, as shown in the figure. It encapsulates packets at the provider edge (PE) router, transports them over the backbone to the PE router on the other side of the cloud, removes the encapsulation, and transports them to the destination. IP addresses are placed at the network layer. Ethernet II is the Ethernet frame format used in TCP/IP networks. A technician has been asked to develop a physical topology for a network that provides a high level of redundancy. Data-link layer protocols, such as PPP, format the IP datagram into a frame. (Choose two.). Physical layer of PC0 will put this frame in wire. Explanation: The IANA is responsible for overseeing and managing IP address allocation, domain name management, and protocol identifiers. A partial mesh topology can also be used where some, but not all, end points connect to one another. Ethernet frames encapsulate IP packets, they don't need an additional layer of encapsulation to go back out over an Ethernet WAN link. Which one of the following is not a function of network layer? Explanation: The mesh topology provides high availability because every node is connected to all other nodes. (Choose two.). Modules 1 – 3: Basic Network Connectivity and Communications Exam Answers, Modules 4 – 7: Ethernet Concepts Exam Answers, Modules 8 – 10: Communicating Between Networks Exam Answers, Modules 11 – 13: IP Addressing Exam Answers, Modules 14 – 15: Network Application Communications Exam Answers, Modules 16 – 17: Building and Securing a Small Network Exam Answers, Modules 1 – 4: Switching Concepts, VLANs, and InterVLAN Routing Exam Answers, Modules 5 – 6: Redundant Networks Exam Answers, Modules 7 – 9: Available and Reliable Networks Exam Answers, Modules 10 – 13: L2 Security and WLANs Exam Answers, Modules 14 – 16: Routing Concepts and Configuration Exam Answers, Modules 1 – 2: OSPF Concepts and Configuration Exam Answers, Modules 3 – 5: Network Security Exam Answers, Modules 9 – 12: Optimize, Monitor, and Troubleshoot Networks Exam Answers, Modules 13 – 14: Emerging Network Technologies Exam Answers, CCIE/CCNP 350-401 ENCOR Dumps Full Questions with VCE & PDF, CCNA 200-301 Dumps Full Questions – Exam Study Guide & Free. 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