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Cisco Network Fundamentals - 2

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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
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
The default gateway address is the address of a router interface that is connected to the same network as the host.

2. Dynamic ports fall into what category of port
Ephermeral
Window size
IRC
TCP

3. Port 520 is?
Routers (the subnetting process)
All
It means ensuring that each segment that the source sends arrives at the destination
RIP (Routing Information Protocol)

4. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Maximum transmission unit
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
FTP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

5. What is the port range for dynamic or private ports
Does not
It is the most common - and it encapsulates transport layer segments
49152 - 65535.
1

6. The three-way handshake performs what three functions?
The default gateway address is the address of a router interface that is connected to the same network as the host.
Window size
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.
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

7. Routes to remote networks with the associated next-hops can be manually configured on the router. What is the same for this type of routing?
Static routing
Web browsing - email - file transfer
20 and 8
Purpose - ownership - and geographic location are key ways to divide a network

8. Encapsulation occurs at all - some or none of the layers of the OSI model?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
FTP
Web browsing - email - file transfer
All

9. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
SMTP
UDP - it sends datagrams as 'best effort'
UDP
Window size

10. What is contained in the header of each segment or datagram?
False. It's like a file - only one process can read/write.
Does not
TCP
The source and destination port number

11. During data transfer - What is the receiving host responsible for?
TCP. It makes larger demands on a network
Does not
TCP
Acknowledgment and reassembly (receipt of packets and putting them in right order)

12. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Packet
Forward the packet to the default route interface (gateway) or just drop/discard the packets
TCP. It makes larger demands on a network

13. Port 23 is?
Connectionless
Telnet
32 - there are four octets of 8 bits each in an IPv4 address
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 ensures more reliable delivery between applications - TCP or UDP?
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
User Datagram Protocol
TCP. It makes larger demands on a network
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

15. What is the purpose of sequence numbers?
Data link - physical
Gateway
Allows the transport layer function on the destination host to reassemble segments in the right order
HTTPS (Secure HTTP)

16. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Routers (the subnetting process)
Packet
TCP uses flow control
Connectionless

17. Port 443 is?
User Datagram Protocol
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.
HTTPS (Secure HTTP)
FTP

18. In networking terms - What is reliability?
Transport
It means ensuring that each segment that the source sends arrives at the destination
Routing table
Acknowledgment field significant

19. Why is IP 'media independent'?
Routers (the subnetting process)
It works the same on all Layer 1 media
Maximum transmission unit
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

20. When the client end of the session has no more data to transfer - it sets the ___________ flag in the header of the segment? (Hint: three-letter acronym)
It is the most common - and it encapsulates transport layer segments
UDP - it sends datagrams as 'best effort'
FIN
Decapsulation

21. 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
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Reliable - connection-oriented protocol (resends if not received)
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.

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

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23. The router a network uses to send and receive messages beyond the network is called a ___________ router.
SMTP
User Datagram Protocol
Gateway
POP3

24. What is the purpose of TCP/UDP port numbers?
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
To track the different conversations crossing the network at the same time
Web browsing - email - file transfer
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

25. IP is designed or not designed to track and manage the flow of packets?
User Datagram Protocol
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
Not - these are done by other protocols in other layers
Unique

26. How does UDP keep track of sequence numbers?

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27. For a network layer packet to travel between hosts - it must be handed down to the _________________ layer - for another layer of encapsulation called framing - and then encoded and put onto the ____________ layer to be sent to the next router.
20 and 8
Data link - physical
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
An alternate HTTP port

28. Port 194 is?
Window size
Dynamic / private
IRC
128

29. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
Synchronize sequence numbers

30. SYN is?
To track the different conversations crossing the network at the same time
Synchronize sequence numbers
User Datagram Protocol
An alternate HTTP port

31. On a particular network how would you determine the default gateway address for a host?
An alternate HTTP port
Maximum transmission unit
128
The default gateway address is the address of a router interface that is connected to the same network as the host.

32. UDP stands for?
POP3
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
User Datagram Protocol
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

33. What two commands can be used to view a host's routing table?
Netstat -r and route print
TFTP - Trivial File Transfer Protocol
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
Not - these are done by other protocols in other layers

34. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
Routers (the subnetting process)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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

35. What is the protocol number for 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
It means ensuring that each segment that the source sends arrives at the destination
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
To track the different conversations crossing the network at the same time

36. Port 110 is?
It Doesn't - TCP does
49152 - 65535.
Connectionless
POP3

37. IP requires that each sending and receiving device have a __________ IP address.
Synchronize sequence numbers
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Decapsulation
Unique

38. What is the port range for well known ports
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Upper

39. List three network applications that use UDP
DNS - video-streaming - VoIP
Gateway
49152 - 65535.
UDP - it sends datagrams as 'best effort'

40. 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?
Packet
Routing table
DNS - video-streaming - VoIP
TCP uses flow control

41. Ephermeral port is what type of port
Dynamic / private
2nd and third choices are correct--TCP is reliable and connection-oriented. IP is the one that's unreliable and connectionless. IP operates at the network layer.
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
False. It's like a file - only one process can read/write.

42. Which is a connectionless protocol - UDP or TCP?
HTTPS (Secure HTTP)
POP3
Connectionless
UDP

43. Which of the following is true about IP?

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44. Routers add routes for the connected networks to their ________________ .
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
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Routing table

45. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
User Datagram Protocol
Upper
False. It's like a file - only one process can read/write.

46. TCP is a ________________ layer protocol.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Allows the transport layer function on the destination host to reassemble segments in the right order
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Transport

47. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
Acknowledgment and reassembly (receipt of packets and putting them in right order)
User Datagram Protocol
The source and destination port number

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

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49. UDP does or does not create a session?
Does not
FIN
The default gateway address is the address of a router interface that is connected to the same network as the host.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

50. What is the default DNS port number?
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
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.
53
TCP. It makes larger demands on a network

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Cisco Network Fundamentals - 2

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