export_week 6 Flashcards
The Internet Protocol (IP) header may be 21 bytes long.
False
The process of determining a path through the internet is called
routing
The process of moving a datagram from a router’s input port to output port is called
forwarding
When a host in a network needs to obtain a valid IP address for itself, it broadcasts a “discover” message that can be handled by a server, which will “offer” an IP address within the correct domain.
Dynamic Host Configuration Protocol (DHCP)
IP datagrams fragments can not be fragmented again.
False
The path MTU is the largest MTU on a path from sender to receiver
False
A group of hosts sharing a common address prefix, behind a router, is called a/an
subnet
Re-assembly of fragmented IP datagrams is handled by…
the destination host
In a subnet, the reserved addresses are the and the (with a highest subnet IP address).
- subnet address
* broadcast address
if an IP datagram is fragmented into 1000-byte fragments, and later encounters a link with an 800-byte MTU, it is dropped.
False
In a fragmented IP datagram, the “offset” IP header field value is exactly equal to the number of bytes of fragmented data preceding this fragment.
False
It is the responsibility of a routing algorithm to determine the cost of an output link.
False
The transport-layer header is encapsulated in the first fragmented IP datagram.
True
It is the responsibility of a routing algorithm to forward packets to the appropriate output link.
False
When a destination host’s IP fragment timer expires, it drops all accumulated fragments corresponding to that timer.
True
In network graph terminology, [a] represent routers.
Nodes
ICMP can carry messages from… (Check all that apply)
Router to Sender Host
Router to Router
Source Host to Destination Host
Destination Host to Source Host
Given an internet represented as a weighted undirected graph, the shortest path between node X and node Y is the path that…
has the smallest sum of edge weights.
The largest amount of data, in bytes, which can be accomodated by a particilar network, link, or physical-layer is called the [a].
Maximum Transmission Unit (MTU)
Flow control is intended primarily to _____________
a. keep a TCP sender from overwhelming a receiver’s buffer
A _________ -type retransmission protocol will retransmit all un-ACK’d segments upon a countdown timer interrupt.
a. Go-back-N
Which of the following are fields in the TCP header? (Select all that apply)
Source Port Destination Port Header Length/Data Offset Window Size Checksum Sequence Number
Which of the following are fields in the UDP header? (Select all that apply)
Checksum
Length
Destination Port
Source Port
The TCP sequence numbers are used to implement ___________.
a. in-order delivery
