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COMPUTER NETWORKS 4
Terms in this set (11)
Whats a link layer packet called?
Difference between router and link-layer switch
A network-layer packet is a datagram. A router forwards a packet based on the packet's IP (layer 3) address. A link-layer switch forwards a packet based on the packet's MAC (layer 2) address
Types of switching fabrics
Switching via memory;
switching via a bus;
switching via an interconnection network
An interconnection network can forward packets in parallel as long as all the packets are being forwarded to different output ports.
Whats HOL and where does it occur?
Head of the line blocking: refers to when a queued packet at the front of the queue blocks the other packets from moving forward even if their output ports are available.
Do routers have IP addresses? If so, how many?
They have one on each interface
Suppose there are three routers between a source host and a destination host.
Ignoring fragmentation, an IP datagram sent from the source host to the destination host will travel over how many interfaces? How many forwarding tables will be indexed to move the datagram from the source to the destination?
3 routing tables
How does the receiving host know which transport layer protocol to deliver data to i.e UDP or TCP?
The 8-bit protocol field in the IP datagram contains information about which transport layer protocol the destination host should pass the segment to
Suppose you purchase a wireless router and connect it to your cable modem.
Also suppose that your ISP dynamically assigns your connected device (that
is, your wireless router) one IP address. Also suppose that you have five PCs
at home that use 802.11 to wirelessly connect to your wireless router. How
are IP addresses assigned to the five PCs? Does the wireless router use NAT?
Why or why not?
Router typically has a DHCP server. DHCP is used to assign IP address to the router interface and the 5 PCs. Wireless router also uses NAT as it obtains only one IP address from the ISP
Link state vs Distance vector routing algorithm
- has complete knowledge of the entire topology(network)
-uses dikstra's algorithm
Distance Vector algorithm
-a node has knowledge of only the nodes that are physically connected to it
-calculates route costs iteratively
- distributed(each node notifies the other when its DV changes0
Why are different inter-AS and intra-AS protocols used in the Internet?
Define and contrast the following terms: subnet, prefix, and BGP route.
A subnet is a portion of a larger network; a subnet does not contain a router; its
boundaries are defined by the router and host interfaces.
A prefix is the network
portion of a CDIRized address; it is written in the form a.b.c.d/x
Suppose that a source node and a destination require that a fixed amount of capacity always be available at all routers on the path between the source and destination node, for the exclusive use of traffic flowing between this source and destination node. Would this argue in favor of a VC or datagram architecture? Why?
In order for a router to maintain an available fixed amount of capacity on the path between the source and destination node for that source destination pair, it would need to know the characteristics of the traffic from all sessions passing through that link. That is, the router must have per-session state in the router. This is possible in a connection-oriented network, but not with a connectionless network. Thus, a connection oriented VC network would be preferable.
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