ITEC51 (Sir Anda) for quiz only Flashcards
WAN Topologies
Pont to point topology
Ring topology
Hub and Spoke topology
Mesh topology
Tiered topology
Hybrid topology
employs a point-to-point circuit between two endpoints
provides a Layer 2 transport service through the service provider network.
packets sent from one site are delivered to the other site and vice versa.
is transparent to the customer network, as if there was a direct physical link between two endpoints
Point to point topology
a ring-shaped WAN constructed with point-to-point transmission facilities can be used to interconnect a small number of sites and provide route redundancy at a potentially minimal incremental cost
can use dynamic routing protocols
Ring topology
if a private network connection between multiple sites is required, a point-to-point topology with multiple point-to-point circuits is one option.
This interface can be expensive. A less expensive option is a point-to-multipoint topology
spokes sites are connected to each other via Hub sites
the network communication between two spokes always travel through the hub
Hub and Spoke topology
any sites can communicate directly with any other sites
is highly redundant
is the most desirable WAN topology
Mesh topology
is a modified version of the basic hub and spoke topology
constructed with dedicated facilities offers improved fault tolerance over the simple star topology without comprising scalability
Tiered topology
is useful in larger, more complex networks
may be developed in a multitiered WAN by using a fully meshed topology for the backbone nodes only.
Hybrid topology
Router Components
Input ports
Routing processor
it performs the physical layer functionality of terminating an incoming physical link to a router
it performs the data link layer functionality needed to interoperate with the data link layer functionality on the other side of the incoming link
it also performs a lookup and forwarding function so that a datagram forwarded into the the switching fabric of the router emerges at he appropriate output port
Input ports
computes the forwarding table, implements routing protocols, and runs the software to configure and manage the router
it also handles any packet whose destination address cannot be found in the forwarding table in the line card
Routing processor
connects the router’s input ports to its output ports
is completely contained with the router - a network inside of a network router
Switching Fabrics
3 Switching Fabrics
Switching Via a Memory
Switching Via a Bus
Switching Via a Crossbar
Router Modes
User Execution Mode
Privileged Mode
Global Configuration Mode
Interface Configuration Mode
ROMMON Mode
is the first mode a user has access to after logging into the router.
this mode allows the user to execute only the basic commands
User Execution Mode
allows users to view the system configuration, restart the system, and enter router configuration mode.
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Privileged mode
