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Cisco Network Fundamentals - 2

Instructions:

Answer 50 questions in 15 minutes.
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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 of the following are true about TCP and IP?

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2. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
Dynamic / private
IRC
SMTP

3. What is the port range for Registered ports
Synchronize sequence numbers
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
FTP

4. What are the three basic characteristics of IPv4?
Unique
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
Connectionless - Best effort (unreliable) - media independent

5. What is the netstat utility used for on a host?
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
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
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.

6. Which of the following is true about IP?

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7. UDP stands for?
Data link - physical
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
User Datagram Protocol
RIP (Routing Information Protocol)

8. The router a network uses to send and receive messages beyond the network is called a ___________ router.
POP3
Gateway
53
FIN

9. What four tasks does the network layer perform?
Purpose - ownership - and geographic location are key ways to divide a network
UDP - it sends datagrams as 'best effort'
TCP uses flow control
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

10. Port 8080 is?
FIN
Purpose - ownership - and geographic location are key ways to divide a network
An alternate HTTP port
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

11. List three network applications that use TCP
It works the same on all Layer 1 media
Web browsing - email - file transfer
RIP (Routing Information Protocol)
Allows the transport layer function on the destination host to reassemble segments in the right order

12. Dynamic ports fall into what category of port
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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.
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
Ephermeral

13. MSN messenger uses TCP or UDP?
TCP
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
Connectionless - Best effort (unreliable) - media independent
TCP. It makes larger demands on a network

14. 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)
Upper
Not - these are done by other protocols in other layers
FIN
It means ensuring that each segment that the source sends arrives at the destination

15. Which of the following are not functions of the network layer?
49152 - 65535.
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
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
Static routing

16. What is the protocol number for UDP?
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.
FIN
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Acknowledgment field significant

17. Port 23 is?
TCP uses flow control
Telnet
Acknowledgment field significant
Packet

18. Encapsulation occurs at all - some or none of the layers of the OSI model?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Netstat -r and route print
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
All

19. 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?
TCP uses flow control
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)
Telnet

20. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Reliable - connection-oriented protocol (resends if not received)
False. It's like a file - only one process can read/write.

21. 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?
Decapsulation
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.
Static routing
49152 - 65535.

22. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
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
User Datagram Protocol
TCP. It makes larger demands on a network
Packet

23. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Destination network - next-hop - metric
Decapsulation
Reliable - connection-oriented protocol (resends if not received)

24. What are the transport layer's responsibilities?
Static routing
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
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
Transport

25. During data transfer - What is the receiving host responsible for?
Web browsing - email - file transfer
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Window size
TFTP - Trivial File Transfer Protocol

26. What is the port range for dynamic or private ports
49152 - 65535.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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.

27. Port 69 is?
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
TFTP - Trivial File Transfer Protocol
Purpose - ownership - and geographic location are key ways to divide a network
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

28. What two commands can be used to view a host's routing table?
Netstat -r and route print
FTP
TCP
Web browsing - email - file transfer

29. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
1
Routers (the subnetting process)
User Datagram Protocol
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.

30. Which protocol ensures more reliable delivery between applications - TCP or UDP?
UDP
User Datagram Protocol
TCP. It makes larger demands on a network
FTP

31. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Connectionless
Routing table
The source and destination port number
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

32. Port 110 is?
32 - there are four octets of 8 bits each in an IPv4 address
TCP
POP3
Connectionless

33. UDP does or does not create a session?
Packet
Does not
Web browsing - email - file transfer
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

34. 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?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Destination network - next-hop - metric
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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

35. Ephermeral port is what type of port
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
Purpose - ownership - and geographic location are key ways to divide a network
Dynamic / private
Netstat -r and route print

36. What information does a router need to successfully forward packets?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Synchronize sequence numbers
Not - these are done by other protocols in other layers
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

37. Which of the following are true about network layer encapsulation?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
To track the different conversations crossing the network at the same time
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.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

38. 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
An alternate HTTP port
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)

39. MTU stands for ?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Packet
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
Maximum transmission unit

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

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41. What kinds of problems are caused by excessive broadcast traffic on a network segment?
53
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Purpose - ownership - and geographic location are key ways to divide a network
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

42. IP requires that each sending and receiving device have a __________ IP address.
53
Does not
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
Unique

43. Why does TCP use a sequence number in the header?
FTP
Destination network - next-hop - metric
The source and destination port 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

44. ACK is?
It Doesn't - TCP does
1
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
Acknowledgment field significant

45. What is the default DNS port number?
Upper
53
The source and destination port number
It is the most common - and it encapsulates transport layer segments

46. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Dynamic / private
HTTPS (Secure HTTP)
Data link - physical
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

47. What is the port range for well known ports
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Connectionless
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

48. Which is a connectionless protocol - UDP or TCP?
User Datagram Protocol
UDP
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
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

49. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
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
Transport
Synchronize sequence numbers

50. IP is designed or not designed to track and manage the flow of packets?
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.
Static routing
Decapsulation
Not - these are done by other protocols in other layers