10. Network layer encapsulation Segment from transport layer Packet header added to make IP packet Sent to data link layer for further encapsulation into frame
11. IPv4 packet header fields IP address of source host, needed so reply can be sent. IP address of destination host, needed so routers can find route.
12. IPv4 packet header fields Reduced by 1 at each router. Packet dropped if it goes to 0. TCP or UDP used in Transport layer.
13. IPv4 packet header fields Priority for QoS. E.g. voice data has higher priority than e-mail. For checking if header has been corrupted.
14. IPv4 packet header fields Shows if packet has been fragmented or must not be fragmented. If router has to split a packet, this gives order for putting pieces together.
15. IPv4 packet header fields Version 4. Length of whole packet. Header length.
17. Splitting up networks Fully switched network, each device has its own bandwidth. You could have hundreds of computers. Why split it up? Too large to manage efficiently Too much broadcast traffic - congestion Too many addresses for switches to remember Lack of security
36. Labs & Activities * If no previous Packet Tracer experience, else strongly recommended Type Detail PT 1.2.4 Mandatory* Lab 1.3.1 Mandatory PT 1.3.2 Mandatory Lab 1.3.3 Review carefully
37.
Notas del editor
CLNS (Servicio No Orientado a Conexión conectionless network service), en telecomunicaciones , es un servicio que establece la comunicación entre entidades sin necesidad de establecer una conexión entre ellas. Cuando una entidad tiene información para transmitir, sencillamente la envía, ( tramas , paquetes , bloques , etc.).
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