50.State what is common to all routers in an autonomous system (AS).
They are typically operated by the same ISP, or belong to the same network. They also all run the same
routing algorithm (LS or DV) and have information about each other.
51.State the tw
31.Describe in one or two sentences, how the receive window is used by the sender.
The receive window is used to give the sender an idea of how much free buffer space is available at the
receiver. It is the amount of spare room in the buffer.
21.Given the number of bytes of data included in a TCP segment and the sequence number in the packet
that is received in order, state the sequence number that will be contained in the acknowledgement for
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22.Given the number
11.Describe the actions of a sender under a go back n protocol when a timeout occurs.
The sender retransmits packet n and all higher sequence number packets in the window
12.Describe the actions of a sender under selective repeat protocol when a timeout o
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Know the meaning and significance of the following terms. For acronyms, make sure you know
what the letters stand for.
Authoritative DNS Server: A DNS server which recursive DNS servers contact in order to
resolve a g
1. Explain the purpose of multiplexing and demultiplexing in the transport layer using one or two
Demultiplexing is delivering the data in a transport-layer segment to the correct socket.
Multiplexing is gathering data chunks at
40.Contrast and compare how packets are routed in a virtual circuit and datagram networks.
Virtual- circuit networks (VC) provide a connection service at the network layer. Datagram networks
provide a connectionless service at the network lay
70.State when routers in different autonomous systems (AS) can use different intra-AS
routing algorithms. (They always can.)
71.Describe the how intra and inter AS routing algorithms are used to build a router
72.Name two commo
60.Describe how hosts are assigned an IP address by explaining the purposes of the DHCP discover,
offer, request, and ack messages.
1. Host broadcast DHCP discover message
2. Server responds with DHCP Offer message
3. Host request IP address using a DHCP
GET cfw_path HTTP/1.1
Logical communication between application processes running on different hosts.
Extending the host-to-host delivery service provided by the network layer to a p
Internet is a networking infrastructure that provides services to distributed application
A network consists of two or more computers that are linked in order to share resources
A protocol defines the format and the order of messages exchanged between two