Chapter 1: Packet Forwarding Flashcards
Access Port
Fundamental building blocks of a managed switch
ARP
Address Resolution Protocol, method of mapping Layer 3 IP addresses to Layer 2 MAC addresses(stores them).
Broadcast Domain
a portion of a network where a single broadcast can be advertised or received, broken up by routers.
CEF
Cisco Express Forwarding, method of forwarding packets in hardware through the use of FIB and adjacency tables, much faster than process switching
Collision Domain
set of devices in a network that can transmit data packets that can collide with each other
CAM
Content Addressable Memory, a high performance table used to correlate MAC addresses to switch interfaces that they are attached to
Layer 2 Forwarding
The forwarding of packets based on the packets destination Layer 2 addresses, such as MAC addresses.
Layer 3 Forwarding
The forwarding of packets based on the packets destination IP addresses.
FIB
Forwarding Information Base, the hardware programming of a forwarding table. The FIB uses the RIB for programming
MAC Address Table
Table on a switch that identifies the switch port and VLAN with which a MAC address is associated for Layer 2 forwarding
Native VLAN
A VLAN that correlates to any untagged network traffic on a trunk port
Process Switching
The process of forwarding traffic by software and processing by the general CPU. It is typically slower than hardware switching
RIB
Routing Information Base, The software database of all the routes, next-hop IP addresses, and attached interfaces. Also known as a routing table.
Trunk Port
A switch port that is configured for multiple VLANs and generally connects a switch to other switches or to other network devices, such as firewalls or routers
TCAM
Ternary Content Addressable Memory, high performance table or tables that can evaluate packet forwarding decisions based on policies or access lists.
