By Scott Bennett
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Extra resources for 31 Days Before Your CCENT Certification (Cisco Networking Academy Program)
The hierarchical design model can be broken into the following three layers: ■ At the access layer, hosts connect to each other on the local network. ■ At the distribution layer, local networks connect to each other. ■ At the core layer, high-speed devices and media connect distribution layer devices. Day 28 25 Figure 28-4 illustrates the hierarchical design model. Figure 28-4 Hierarchical Design Model Core Layer Distribution Layer Access Layer Whereas a MAC address provides a unique identifier on a local network, an Internet Protocol (IP) address identifies the location of a host in a divided hierarchical network.
1: The web address (or domain name) that you enter into a browser is translated into an IP address using Domain Name System (DNS). Like an HTTP server responds to port 80 requests, a DNS server responds to requests on port 53. However, if a DNS server does not know the IP for the domain, it forwards the request to another DNS server. If other DNS servers do not have an entry for the domain, the request times out. 5: Table 29-2 describes communication between web, FTP, e-mail, and instant messaging (IM) clients and servers.
3. At the Internet layer, the TCP segments are encapsulated into Internet Protocol (IP) packets and are given an IP header with a source and destination IP address. 4. The network access layer uses the Ethernet protocol to encapsulate the packets into frames. Each frame has a header including a source and destination media access control (MAC) address, as well as a cyclical redundancy check (CRC) field at the end of the frame to verify proper transmission. In this layer, the frames are also encoded into bits and are sent electronically over the medium by the network interface card (NIC).
31 Days Before Your CCENT Certification (Cisco Networking Academy Program) by Scott Bennett