Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Which is a connection-oriented protocol - TCP or UDP?
TFTP - Trivial File Transfer Protocol
Destination network - next-hop - metric
It means ensuring that each segment that the source sends arrives at the destination
TCP


2. What is the port range for well known ports
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
It is the most common - and it encapsulates transport layer segments
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
53


3. Which is a connectionless protocol - UDP or TCP?
Transport
UDP
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
It Doesn't - TCP does


4. What kinds of problems are caused by excessive broadcast traffic on a network segment?
128
Data link - physical
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts


5. How does UDP keep track of sequence numbers?

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6. Port 8080 is?
UDP - it sends datagrams as 'best effort'
32 - there are four octets of 8 bits each in an IPv4 address
An alternate HTTP port
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses


7. IP requires that each sending and receiving device have a __________ IP address.
SMTP
Does not
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Unique


8. Ports can be shared at the same time? (t/f)

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9. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
To reassemble the segments into data - To identify the application layer protocol - To indicate the number of the next expected byte - To show the maximum number of bytes allowed during a session. Allows the receiving host to reassemble segments in p
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
User Datagram Protocol
1


10. List three network applications that use TCP
False. It's like a file - only one process can read/write.
Transport
Web browsing - email - file transfer
Static routing


11. Which of the following is true about IP?

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12. Routers add routes for the connected networks to their ________________ .
Routing table
Web browsing - email - file transfer
Static routing
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use


13. At the transport layer - which of the following controls is used to keep a transmitting host from overflowing the buffers of a receiving host? Choose one: Best effort - encryption - flow control - congestion avoidance?
Unique
TCP uses flow control
DNS - video-streaming - VoIP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)


14. Which protocol provides just the basic functions for efficiently delivering data pieces between appropriate applications - TCP or UDP?

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15. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
It works the same on all Layer 1 media
Gateway
POP3


16. Which protocol ensures more reliable delivery between applications - TCP or UDP?
TCP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
TCP. It makes larger demands on a network
POP3


17. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
Web browsing - email - file transfer
49152 - 65535.
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation


18. What is the purpose of sequence numbers?
TCP
128
Allows the transport layer function on the destination host to reassemble segments in the right order
1


19. Ephermeral port is what type of port
Dynamic / private
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Allows the transport layer function on the destination host to reassemble segments in the right order
Forward the packet to the default route interface (gateway) or just drop/discard the packets


20. Encapsulation occurs at all - some or none of the layers of the OSI model?
It is used by both routers and hosts. The second one is incorrect because IP uses addressing information in the header to determine the best path for the packet. 'Reliable' is incorrect because IP is only a 'best effort' protocol
Allows the transport layer function on the destination host to reassemble segments in the right order
Reliable - connection-oriented protocol (resends if not received)
All


21. What is the port range for dynamic or private ports
Netstat -r and route print
TCP
FTP
49152 - 65535.


22. Why is IP 'media independent'?
Window size
128
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It works the same on all Layer 1 media


23. MTU stands for ?
DNS - video-streaming - VoIP
Synchronize sequence numbers
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Maximum transmission unit


24. Port 69 is?
TCP. It makes larger demands on a network
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Packet
TFTP - Trivial File Transfer Protocol


25. The three-way handshake performs what three functions?
Not - these are done by other protocols in other layers
It is the most common - and it encapsulates transport layer segments
Destination device is there - Figures out if it has an active service running and is accepting requests on the right port - Tells the destination device that it wants to communicate on said port
False. It's like a file - only one process can read/write.


26. Name the private address blocks
TCP
Packet
RIP (Routing Information Protocol)
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255


27. Port 110 is?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
POP3
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts


28. UDP does or does not create a session?
Transport
Does not
It means ensuring that each segment that the source sends arrives at the destination
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.


29. Dynamic ports fall into what category of port
Connectionless
20 and 8
Ephermeral
Gateway


30. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
It works the same on all Layer 1 media
49152 - 65535.
Purpose - ownership - and geographic location are key ways to divide a network


31. Which of the following are true about network layer encapsulation?
It works the same on all Layer 1 media
128
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
UDP


32. What is the purpose of the ToS field in the IPv4 header?
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
HTTPS (Secure HTTP)
Gateway


33. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
SMTP


34. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.
Decapsulation
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255


35. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Telnet
Does not
Delivery reliability and application data analysis. The first is a transport layer concern - and the second is the presentation layer. Routing - addressing packets with an IP adress - encapsulation and decapsulation are functions of the network layer


36. ACK is?
POP3
Acknowledgment field significant
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Upper


37. Which of the following are true about static and dynamic routing?
TFTP - Trivial File Transfer Protocol
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
FTP
It adds a header - and adds both source and destination IP addresses. Network layer encapsulation happens only on the original host; other devices can read the data - but they do not remove or alter it until the destination network is reached.


38. What is the proper order of SYN sequence?
32 - there are four octets of 8 bits each in an IPv4 address
Connectionless - Best effort (unreliable) - media independent
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Static routing


39. The three main features of routes in a routing table are?
Destination network - next-hop - metric
An alternate HTTP port
Packet
TCP


40. Which of the following are true about TCP and IP?

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41. What two commands can be used to view a host's routing table?
Netstat -r and route print
All
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation


42. Port 25 is?
The type-of-service field contains an 8-bit binary value that is used to determine the priority of each packet. This enables QoS (Quality of service) to happen.
SMTP
Connectionless - Best effort (unreliable) - media independent
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route


43. What does segmentation provide to communications?
Connectionless - Best effort (unreliable) - media independent
53
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)


44. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Window size
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
It Doesn't - TCP does


45. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Keeping track of the individual conversations taking place between applications on the source and destinations hosts - Segmenting data and adding a header - Using header info to reassemble the segments into application data - Passing the assembled da
False. It's like a file - only one process can read/write.
HTTPS (Secure HTTP)


46. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
Web browsing - email - file transfer
128
10.0.0.0/8 10.0.0.0 to 10.255.255.255 - 172.16.0.0/12 172.16.0.0 to 172.31.255.255 - 192.168.0.0/16 192.168.0.0 to 192.168.255.255


47. MSN messenger uses TCP or UDP?
Data link - physical
TFTP - Trivial File Transfer Protocol
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction
TCP


48. What is the netstat utility used for on a host?
UDP - it sends datagrams as 'best effort'
49152 - 65535.
Netstat lists the protocols in use - the local address and port number - the foreign address and port number - and the state of the connection. Also displays active TCP connections - ports on which the computer is listening - Ethernet statistics - th
It Doesn't - TCP does


49. What is the port range for Registered ports
The router matches the destination address in the packet header with the destination network of a route in the routing table and forwards the packet to the next-hop router specified by that route
FIN
UDP
1024 - 49151. Unlike ports with lower numbers - developers of new TCP/UDP services can select a specific number to register with IANA rather than having a number assigned to them. Using registered ports also avoids the additional security restriction


50. What are three key factors to consider when grouping hosts into a common network?
Allows the transport layer function on the destination host to reassemble segments in the right order
A broadcast domain is a logical part of a network (a network segment) in which any network equipment can transmit data directly to another equipment or device without going through a routing device (assuming the devices share the same subnet and use
Purpose - ownership - and geographic location are key ways to divide a network
Source and destination (ports) - Sequencing - Acknowledgement - Flow control