Test your basic knowledge |

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. Port 443 is?
It Doesn't - TCP does
HTTPS (Secure HTTP)
49152 - 65535.
Not - these are done by other protocols in other layers

2. Are well known ports registered
The source and destination port number
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Not - these are done by other protocols in other layers

3. On a particular network how would you determine the default gateway address for a host?
The default gateway address is the address of a router interface that is connected to the same network as the host.
The source and destination port number
TFTP - Trivial File Transfer Protocol
Decapsulation

4. Why does TCP use a sequence number in the header?
Web browsing - email - file transfer
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
TCP
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

5. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
RIP (Routing Information Protocol)
Forward the packet to the default route interface (gateway) or just drop/discard the packets
It means ensuring that each segment that the source sends arrives at the destination
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

6. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Allows the transport layer function on the destination host to reassemble segments in the right order
Purpose - ownership - and geographic location are key ways to divide a network
TFTP - Trivial File Transfer Protocol
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

7. TCP is a ________________ layer protocol.
Transport
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Maximum transmission unit
The source and destination port number

8. Why is IP 'media independent'?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Data link - physical
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
It works the same on all Layer 1 media

9. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Decapsulation
Window size
Connectionless
To track the different conversations crossing the network at the same time

10. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Not - these are done by other protocols in other layers
To track the different conversations crossing the network at the same time
Connectionless

11. How does UDP keep track of sequence numbers?

12. UDP does or does not create a session?
Does not
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.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
It Doesn't - TCP does

13. What is the proper order of FIN sequence?
128
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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

14. Port 194 is?
Data link - physical
False. It's like a file - only one process can read/write.
Connectionless - Best effort (unreliable) - media independent
IRC

15. What is contained in the header of each segment or datagram?
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
User Datagram Protocol
SMTP
The source and destination port number

16. List three network applications that use UDP
Packet
DNS - video-streaming - VoIP
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
RIP (Routing Information Protocol)

17. How many bits are in an IPv4 address?
Window size
Dynamic / private
32 - there are four octets of 8 bits each in an IPv4 address
FIN

18. Routers add routes for the connected networks to their ________________ .
Routing table
It works the same on all Layer 1 media
Upper
It Doesn't - TCP does

19. Pieces of information about a route that a routing table contains
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
TFTP - Trivial File Transfer Protocol
53
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

20. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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
Dynamic / private
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

21. IP requires that each sending and receiving device have a __________ IP address.
Destination network - next-hop - metric
UDP
Unique
TCP

22. Name the private address blocks
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Connectionless - Best effort (unreliable) - media independent
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
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

23. Which of the following are true about IP?
Unique
It is the most common - and it encapsulates transport layer segments
TCP
It Doesn't - TCP does

24. What is the protocol number for UDP?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
FTP
It works the same on all Layer 1 media

25. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Telnet
To track the different conversations crossing the network at the same time
Upper
The source and destination port number

26. What is the purpose of TCP/UDP port numbers?
32 - there are four octets of 8 bits each in an IPv4 address
49152 - 65535.
Gateway
To track the different conversations crossing the network at the same time

27. What is the port range for Registered ports
SMTP
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
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
All

28. What is the netstat utility used for on a host?
POP3
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
Connectionless - Best effort (unreliable) - media independent
Netstat -r and route print

29. Port 20 is?
DNS - video-streaming - VoIP
FTP
Window size
It means ensuring that each segment that the source sends arrives at the destination

30. What does segmentation provide to communications?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
1
Gateway
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

31. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Transport
Packet
Netstat -r and route print
DNS - video-streaming - VoIP

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

33. What is the purpose of sequence numbers?
It Doesn't - TCP does
UDP
32 - there are four octets of 8 bits each in an IPv4 address
Allows the transport layer function on the destination host to reassemble segments in the right order

34. What information does a router need to successfully forward packets?
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
TCP
TCP. It makes larger demands on a network
Allows the transport layer function on the destination host to reassemble segments in the right order

35. What are the transport layer's responsibilities?
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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

36. Which of the following is true about IP?

37. ACK is?
Ephermeral
Acknowledgment field significant
It works the same on all Layer 1 media
53

38. Port 8080 is?
Decapsulation
Web browsing - email - file transfer
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

39. What is the default DNS port number?
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.
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
53
Purpose - ownership - and geographic location are key ways to divide a network

40. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Transport
1
Allows the transport layer function on the destination host to reassemble segments in the right order
Purpose - ownership - and geographic location are key ways to divide a network

41. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
FIN
Reliable - connection-oriented protocol (resends if not received)
All
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

42. Dynamic ports fall into what category of port
HTTPS (Secure HTTP)
Ephermeral
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
SMTP

43. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Transport
Routers (the subnetting process)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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

44. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Upper
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

45. 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
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
1
Netstat -r and route print

46. The router a network uses to send and receive messages beyond the network is called a ___________ router.
TCP
Gateway
Allows the transport layer function on the destination host to reassemble segments in the right order
It works the same on all Layer 1 media

47. What is the port range for dynamic or private ports
To track the different conversations crossing the network at the same time
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
It Doesn't - TCP does
49152 - 65535.

48. Which of the following are not functions of the network layer?
20 and 8
Acknowledgment and reassembly (receipt of packets and putting them in right order)
UDP - it sends datagrams as 'best effort'
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. The three main features of routes in a routing table are?
It works the same on all Layer 1 media
Forward the packet to the default route interface (gateway) or just drop/discard the packets
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Destination network - next-hop - metric

50. Port 520 is?
All
Window size
RIP (Routing Information Protocol)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer