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. What are the transport layer's responsibilities?
Netstat -r and route print
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 #
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

2. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
53
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
UDP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

3. What information does a router need to successfully forward packets?
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 default gateway address is the address of a router interface that is connected to the same network as the host.
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

4. Are well known ports registered
DNS - video-streaming - VoIP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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
Routers (the subnetting process)

5. 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.
Not - these are done by other protocols in other layers
Allows the transport layer function on the destination host to reassemble segments in the right order
Decapsulation

6. 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.
False. It's like a file - only one process can read/write.
Reliable - connection-oriented protocol (resends if not received)
Unique
Data link - physical

7. Name the private address blocks
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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
TCP
Forward the packet to the default route interface (gateway) or just drop/discard the packets

8. 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?
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.
Static routing
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

9. Which of the following is true about IP?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

10. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
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
20 and 8
Reliable - connection-oriented protocol (resends if not received)

11. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
An alternate HTTP port
53
Upper
SMTP

12. How does UDP keep track of sequence numbers?

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

13. ACK is?
Acknowledgment field significant
TFTP - Trivial File Transfer Protocol
Dynamic / private
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

14. UDP does or does not create a session?
Decapsulation
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Does not

15. What is the proper order of FIN sequence?
Reliable - connection-oriented protocol (resends if not received)
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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.
49152 - 65535.

16. 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
To track the different conversations crossing the network at the same time
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Does not

17. SYN is?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Synchronize sequence numbers
Purpose - ownership - and geographic location are key ways to divide a network
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

18. Routers add routes for the connected networks to their ________________ .
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
Routing table
49152 - 65535.
TCP

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

20. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
It Doesn't - TCP does
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Gateway

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

22. List three network applications that use TCP
User Datagram Protocol
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
Web browsing - email - file transfer

23. 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
TCP. It makes larger demands on a network
The source and destination port number
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

24. Why is IP 'media independent'?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
It works the same on all Layer 1 media
49152 - 65535.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

25. What is contained in the header of each segment or datagram?
The source and destination port number
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
TCP
Connectionless

26. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Connectionless
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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.

27. What does segmentation provide to communications?
Does not
Telnet
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

28. Why does TCP use a sequence number in the header?
POP3
It is the most common - and it encapsulates transport layer segments
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
Upper

29. Which of the following are true about network layer encapsulation?
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
TCP uses flow control
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.
Window size

30. Ephermeral port is what type of port
Dynamic / private
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Transport
Packet

31. Port 110 is?
20 and 8
POP3
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 source and destination port number

32. What is the proper order of SYN sequence?
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.
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

33. MSN messenger uses TCP or UDP?
Does not
TCP
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

34. Port 520 is?
RIP (Routing Information Protocol)
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
To track the different conversations crossing the network at the same time
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 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.
Routing table
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Packet

36. The three main features of routes in a routing table are?
Transport
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Destination network - next-hop - metric
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

37. What is the default DNS port number?
53
SMTP
Transport
Destination network - next-hop - metric

38. Pieces of information about a route that a routing table contains
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.
It is the most common - and it encapsulates transport layer segments
Routing table
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

39. Which of the following are not functions of the network layer?
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 is the most common - and it encapsulates transport layer segments
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
32 - there are four octets of 8 bits each in an IPv4 address

40. 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)
To track the different conversations crossing the network at the same time
Synchronize sequence numbers
Telnet

41. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
UDP
POP3
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Forward the packet to the default route interface (gateway) or just drop/discard the packets

42. TCP header provides for
Allows the transport layer function on the destination host to reassemble segments in the right order
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Telnet
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

43. What two commands can be used to view a host's routing table?
RIP (Routing Information Protocol)
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Not - these are done by other protocols in other layers
Netstat -r and route print

44. 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
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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

45. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Window size
Decapsulation
TCP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

46. What are three key factors to consider when grouping hosts into a common network?
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
HTTPS (Secure HTTP)
Purpose - ownership - and geographic location are key ways to divide a network
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

47. 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)
Packet
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Connectionless
FIN

48. What is the netstat utility used for on a host?
It works the same on all Layer 1 media
Gateway
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
Maximum transmission unit

49. What is the port range for dynamic or private ports
49152 - 65535.
TFTP - Trivial File Transfer Protocol
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
FTP

50. Port 69 is?
TFTP - Trivial File Transfer Protocol
User Datagram Protocol
49152 - 65535.
Web browsing - email - file transfer