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Cisco Network Fundamentals - 2

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. List three network applications that use TCP
TFTP - Trivial File Transfer Protocol
Destination network - next-hop - metric
Synchronize sequence numbers
Web browsing - email - file transfer

2. ACK is?
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.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Acknowledgment field significant
IRC

3. How many bits are in an IPv4 address?
Static routing
32 - there are four octets of 8 bits each in an IPv4 address
The source and destination port number
Ephermeral

4. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Ephermeral
Static routing
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

5. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Telnet
20 and 8
Allows the transport layer function on the destination host to reassemble segments in the right order
Window size

6. Port 520 is?
RIP (Routing Information Protocol)
TFTP - Trivial File Transfer Protocol
All
To track the different conversations crossing the network at the same time

7. What are three key factors to consider when grouping hosts into a common network?
Does not
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
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Purpose - ownership - and geographic location are key ways to divide a network

8. In networking terms - What is reliability?
Static routing
UDP
It means ensuring that each segment that the source sends arrives at the destination
The source and destination port number

9. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Connectionless
128
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Maximum transmission unit

10. Which of the following are not functions of 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
Not - these are done by other protocols in other layers
Telnet
TCP

11. Are well known ports registered
Transport
Connectionless
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

12. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
53
TCP uses flow control
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

13. What is contained in the header of each segment or datagram?
The source and destination port number
FIN
Unique
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

14. Port 25 is?
Destination network - next-hop - metric
POP3
SMTP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

15. Port 194 is?
Telnet
FIN
IRC
Web browsing - email - file transfer

16. What is the proper order of FIN sequence?
Reliable - connection-oriented protocol (resends if not received)
Forward the packet to the default route interface (gateway) or just drop/discard the packets
UDP
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

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

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18. 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
Not - these are done by other protocols in other layers
IRC
Unique

19. Name the private address blocks
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Static routing
Purpose - ownership - and geographic location are key ways to divide a network
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

20. MTU stands for ?
Web browsing - email - file transfer
Maximum transmission unit
Unique
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

21. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
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
Does not
Packet
Window size

22. 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)
FIN
Acknowledgment field significant
The source and destination port number
False. It's like a file - only one process can read/write.

23. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
It Doesn't - TCP does
Unique
User Datagram Protocol
Reliable - connection-oriented protocol (resends if not received)

24. What is the port range for dynamic or private ports
49152 - 65535.
It works the same on all Layer 1 media
It is the most common - and it encapsulates transport layer segments
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

25. Why is IP 'media independent'?
Window size
Ephermeral
Netstat -r and route print
It works the same on all Layer 1 media

26. Which of the following is true about IP?

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27. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Purpose - ownership - and geographic location are key ways to divide a network
Unique

28. The three-way handshake performs what three functions?
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets
UDP
RIP (Routing Information Protocol)

29. Port 110 is?
Does not
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
POP3
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

30. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
IRC
DNS - video-streaming - VoIP

31. 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
Connectionless - Best effort (unreliable) - media independent
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.

32. MSN messenger uses TCP or UDP?
Reliable - connection-oriented protocol (resends if not received)
Connectionless
TCP
Acknowledgment and reassembly (receipt of packets and putting them in right order)

33. What is the purpose of sequence numbers?
Static routing
Allows the transport layer function on the destination host to reassemble segments in the right order
Window size
It means ensuring that each segment that the source sends arrives at the destination

34. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
IRC
It means ensuring that each segment that the source sends arrives at the destination
Routers (the subnetting process)
TCP uses flow control

35. What does segmentation provide to communications?
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.
The source and destination port number
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
An alternate HTTP port

36. Which is a connection-oriented protocol - TCP or UDP?
TCP
It is the most common - and it encapsulates transport layer segments
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
FIN

37. Port 20 is?
FTP
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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
1

38. Which of the following are true about IP?
Decapsulation
TCP
20 and 8
It is the most common - and it encapsulates transport layer segments

39. What is the default DNS port number?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
IRC
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
53

40. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Decapsulation
Gateway
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.
Maximum transmission unit

41. Why does TCP use a sequence number in the header?
Maximum transmission unit
TCP. It makes larger demands on a network
It Doesn't - TCP does
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

42. Port 23 is?
False. It's like a file - only one process can read/write.
Telnet
Allows the transport layer function on the destination host to reassemble segments in the right order
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

43. During data transfer - What is the receiving host responsible for?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Synchronize sequence numbers
Upper

44. How does UDP keep track of sequence numbers?

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45. What two commands can be used to view a host's routing table?
Netstat -r and route print
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)
TCP uses flow control

46. What is the protocol number for UDP?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Decapsulation
Destination network - next-hop - metric
To track the different conversations crossing the network at the same time

47. The three main features of routes in a routing table are?
53
Destination network - next-hop - metric
Acknowledgment and reassembly (receipt of packets and putting them in right order)
TCP uses flow control

48. SYN is?
Synchronize sequence numbers
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Data link - physical
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

49. Which of the following are true about static and dynamic routing?
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
HTTPS (Secure HTTP)
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
UDP - it sends datagrams as 'best effort'

50. Dynamic ports fall into what category of port
Ephermeral
FIN
The source and destination port number
False. It's like a file - only one process can read/write.