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Exam 2 - Review

Terms in this set (41)

This protocol has a send window size of 1
Stop and wait
Who dictates the size of the send window in TCP
The Receiver
An application wants to send a live video stream to another program. Which would be the best choice to use?
UDP
Which protocols are byte oriented?
TCP
If router 1 (in between 2 networks) uses a proxy ARP does it change which device will see an ARP Request from A? (will it impact the ip addresses?)
No
Which command-line utility is commonly used to send/receive ICMP echo request/reply messages?
ping
What is the range of well-known port numbers?
0-1023
Which protocols are connection oriented
TCP and SCTP
Which is not a technique to handle the count to infinity problem?
1. Redefine infinity
2. Split Horizon
3. Poison Reverse
4. Rollover
Rollover
A router using RIP initially has 20 entries in its routing table. It does not receive information about 2 routes in 350 seconds. It does not receive information about 4 routes in 250 sec. How many timers are currently running?
19
A timestamp request is sent from CPU C to CPU G and a reply is received. IF the original Timestamp is 43 and the return time is 46, what is the rt time?
5
What is the output of the following python program?

import ipaddress
interface = ipaddres.ip_interface("192.168.1.10/24")
if interface.is_private:
print(interface, "is a private address")
else:
print(interface, "is a non-private address")
192.168.1.10/24 is a private address
An application wants to send a single short message to another program. Which protocol would be the best choice to use?
UDP
This protocol can send multiple packets without waiting for the next acknowledgement.
Simple
Go Back N
Selective Repeat
Under what circumstances could an ICMP time-exceeded message be generated?
TTL reaches 0
Fragmentation timer time-out
If CWND = 20 MSS at the time congestion is detected due to 3 duplicate acknowledgements (fast transmission) what will be the new value of the CWND and the Threshold?
CWND= 10MSS, Threshold= 10MSS
This protocol has a receive window size of 1.
Stop n wait and Go Back N
This protocol acknowledges Out of order packets
Selective Repeat
This protocol never sends the next packet until the current packet has been acknowledged.
Stop n Wait
Which protocols are message-oriented?
UDP and SCTP
What is the role of IGMP?
Creating/Maintaining Multicast Group Membership
What is the typical sequence of packets to establish a conncetion over TCP?
1. Sender sends a SYN packet to Receiver

2. Receiver sends a SYN + Acknowledgment packet to Sender

3. Sender sends a final Acknowledgment packet to Receiv
The checksum field can be left blank in UDP ?
True
Why does an ATM network have to use ATMARP instead of just ARP?
Because ATM networks do not support broadcasting
Computer F responds to an ARP Request from computer E. Which devices typically see this response?
Only computer E, responses or unicast
Select the timing values that require synchronized clocks in order to be accurately calculated using a single ICMP timestamp request/reply message?
Sending time
Receiving Time
What is the output of the following python program assuming the user enters "20"

fav_number = input("Enter your favorite number:") #User enters 20 here

print(fav_number*2)
2020
An application wants to transfer a potentially large file to another program. Which protocol would be the best choice to use?
TCP
How can a TCP connection be closed immediately without following the usual handshake procedure?
Send a RST packet
This protocol does not use acknowledgments
simple protocol
Which transport layer header field is used to identify which process a packet belongs to?
destination port
Which protocols are used w/ an Autonomous System?
RIP and OSPF
ARP is used when you __________?
have a logical address and you need the physical address
Which protocols are used between Autonomous Systems?
BGP
Which protocols are reliable out UDP, TCP and SCTP?
TCP and SCTP
What is the IP block designated for Multicasting addresses?
224.0.0/4
What role does ICMP play in allowing the traceroute (tracert) program to work?
ICMP augments IP with error messages and query management. ICMP uses echo request/reply to test the network connections. Tracert uses the echo request/reply and the TTL values to see which destinations are struggling to function, along with how long it takes to get to each destination.
What is the typical sequence of packets to close a connection over TCP?
1. 1 side sends a FIN packet to the other

2. The other side then sends a FIN + Ack packet in return

3. The original sender of the FIN packet then responds with a final Ack packet
True or False: In order to calcuate the round-trip time using an ICMP Timestamp request/reply the two machines must have synchronized clocks.
False
What is the range of port numbers?
0-65535
Which timer prevents deadlock from occuring when the rwnd size is set to 0?
Keep-Alive Timer
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