By Todd Lammle
This is often an identical e-book Strayer used for CIS 339 in spring of 2009. keep your fifty dollars and choose this one up reasonable on-line.
Read or Download CCDA: Cisco Certified Design Associate Study Guide, 2nd Edition (640-861) PDF
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Additional resources for CCDA: Cisco Certified Design Associate Study Guide, 2nd Edition (640-861)
Transmit In fundamental, reliable, connection-oriented data transfer, datagrams are delivered to the receiving host in exactly the same sequence they’re transmitted; the transmission fails if this order is breached. , 1151 Marina Village Parkway, Alameda, CA 94501. com The OSI Reference Model 25 segments are lost, duplicated, or damaged along the way, this will cause a failure to transmit. The answer to the problem is to have the receiving host acknowledge receiving each and every data segment.
Com Internetworking Fundamentals 9 Routers Routers are a step up from bridges. Bridges filter by MAC address, but routers can filter by both hardware and network address (IP address). Repeaters operate at layer 1, bridges and switches layer 2, and routers layer 3 of the OSI reference model, which I will cover at length later in this chapter. When a bridge forwards a packet, it sends it out to all segments to which it is connected, whereas a router only forwards packets to the network segment that the packet is destined for.
When it sends a segment, the transmitting machine starts a timer and retransmits if it expires before an acknowledgment for the segment is returned from the receiving end. 14, the sending machine transmits segments 1, 2, and 3. The receiving node acknowledges it has received them by requesting segment 4. When it receives the acknowledgment, the sender then transmits segments 4, 5, and 6. If segment 5 doesn’t make it to the destination, the receiving node acknowledges that event with a request for the segment to be resent.