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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. What is the purpose of sequence numbers?
Decapsulation
Allows the transport layer function on the destination host to reassemble segments in the right order
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
DNS - video-streaming - VoIP

2. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
Unique
UDP - it sends datagrams as 'best effort'

3. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
Reliable - connection-oriented protocol (resends if not received)
Acknowledgment field significant
RIP (Routing Information Protocol)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

4. IP is designed or not designed to track and manage the flow of packets?
User Datagram Protocol
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Not - these are done by other protocols in other layers
It is the most common - and it encapsulates transport layer segments

5. 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)
Window size
SMTP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

6. Port 20 is?
FTP
It Doesn't - TCP does
Acknowledgment field significant
Routing table

7. What is the purpose of the ToS field in the IPv4 header?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Connectionless - Best effort (unreliable) - media independent
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

8. Encapsulation occurs at all - some or none of the layers of the OSI model?
Telnet
All
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
It Doesn't - TCP does

9. Ephermeral port is what type of port
An alternate HTTP port
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
UDP - it sends datagrams as 'best effort'
Dynamic / private

10. What are the transport layer's responsibilities?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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
The default gateway address is the address of a router interface that is connected to the same network as the host.

11. What is the netstat utility used for on a host?
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.
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
Upper
The default gateway address is the address of a router interface that is connected to the same network as the host.

12. List three network applications that use UDP
Ephermeral
Reliable - connection-oriented protocol (resends if not received)
DNS - video-streaming - VoIP
Web browsing - email - file transfer

13. The three main features of routes in a routing table are?
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.
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 -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Destination network - next-hop - metric

14. How many bits are in an IPv6 address?
Transport
Static routing
UDP
128

15. Dynamic ports fall into what category of port
Transport
Ephermeral
POP3
Connectionless - Best effort (unreliable) - media independent

16. What is the port range for well known ports
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
Synchronize sequence numbers
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
FIN

17. What is the purpose of TCP/UDP port numbers?
Upper
POP3
Destination network - next-hop - metric
To track the different conversations crossing the network at the same time

18. UDP does or does not create a session?
53
128
Does not
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

19. Port 194 is?
IRC
User Datagram Protocol
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
49152 - 65535.

20. What is the proper order of FIN sequence?
Purpose - ownership - and geographic location are key ways to divide a network
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Netstat -r and route print
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

21. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Decapsulation
All
Not - these are done by other protocols in other layers
Gateway

22. Port 23 is?
Acknowledgment field significant
Synchronize sequence numbers
Telnet
FIN

23. Port 69 is?
Gateway
TCP
TFTP - Trivial File Transfer Protocol
20 and 8

24. MTU stands for ?
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
It Doesn't - TCP does
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Maximum transmission unit

25. What is the default DNS port number?
32 - there are four octets of 8 bits each in an IPv4 address
53
HTTPS (Secure HTTP)
IRC

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

27. MSN messenger uses TCP or UDP?
TCP
Purpose - ownership - and geographic location are key ways to divide a network
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
POP3

28. List three network applications that use TCP
128
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Web browsing - email - file transfer
False. It's like a file - only one process can read/write.

29. Which of the following are true about static and dynamic routing?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
FIN
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

30. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Gateway
HTTPS (Secure HTTP)
1
Synchronize sequence numbers

31. What is a broadcast domain?
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
Destination network - next-hop - metric
It is the most common - and it encapsulates transport layer segments
128

32. IP requires that each sending and receiving device have a __________ IP address.
Netstat -r and route print
Telnet
Unique
Not - these are done by other protocols in other layers

33. TCP header provides for
Window size
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
TCP. It makes larger demands on a network
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

34. What is the port range for Registered ports
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
To track the different conversations crossing the network at the same time
Data link - physical
TFTP - Trivial File Transfer Protocol

35. Routers add routes for the connected networks to their ________________ .
Routing table
It means ensuring that each segment that the source sends arrives at the destination
Does not
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

36. Which is a connectionless protocol - UDP or TCP?
Static routing
RIP (Routing Information Protocol)
UDP
Destination network - next-hop - metric

37. What are three key factors to consider when grouping hosts into a common network?
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
It works the same on all Layer 1 media
Acknowledgment and reassembly (receipt of packets and putting them in right order)

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

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39. TCP is a ________________ layer protocol.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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.
Transport
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

40. What is the port range for dynamic or private ports
49152 - 65535.
HTTPS (Secure HTTP)
TCP
UDP - it sends datagrams as 'best effort'

41. UDP stands for?
Window size
User Datagram Protocol
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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

42. In networking terms - What is reliability?
32 - there are four octets of 8 bits each in an IPv4 address
Acknowledgment and reassembly (receipt of packets and putting them in right order)
It means ensuring that each segment that the source sends arrives at the destination
20 and 8

43. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
Forward the packet to the default route interface (gateway) or just drop/discard the packets
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Routing table

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

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45. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
It works the same on all Layer 1 media
Packet
32 - there are four octets of 8 bits each in an IPv4 address
Connectionless

46. 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)
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
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
FIN
Synchronize sequence numbers

47. Port 8080 is?
An alternate HTTP 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
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

48. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
TFTP - Trivial File Transfer Protocol
53
UDP

49. 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?
Allows the transport layer function on the destination host to reassemble segments in the right order
Static routing
Does not
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.

50. Why is IP 'media independent'?
Gateway
UDP - it sends datagrams as 'best effort'
Unique
It works the same on all Layer 1 media