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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. Port 23 is?
Unique
Telnet
49152 - 65535.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

2. In networking terms - What is reliability?
Data link - physical
It means ensuring that each segment that the source sends arrives at the destination
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
Decapsulation

3. Port 25 is?
SMTP
Web browsing - email - file transfer
TCP. It makes larger demands on a network
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

4. Are well known ports registered
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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
Acknowledgment field significant
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

5. What information does a router need to successfully forward packets?
Not - these are done by other protocols in other layers
TCP uses flow control
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
TFTP - Trivial File Transfer Protocol

6. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
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.
Window size
Netstat -r and route print
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

7. Which of the following is true about IP?

8. What is the proper order of FIN sequence?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Does not
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Ephermeral

9. Which is a connection-oriented protocol - TCP or UDP?
All
TCP
DNS - video-streaming - VoIP
Purpose - ownership - and geographic location are key ways to divide a network

10. 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?
IRC
TFTP - Trivial File Transfer Protocol
TCP uses flow control
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. The router a network uses to send and receive messages beyond the network is called a ___________ router.
SMTP
Gateway
Dynamic / private
It means ensuring that each segment that the source sends arrives at the destination

12. During data transfer - What is the receiving host responsible for?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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
False. It's like a file - only one process can read/write.
IRC

13. The three main features of routes in a routing table are?
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
Destination network - next-hop - metric
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

14. Which is a connectionless protocol - UDP or TCP?
Purpose - ownership - and geographic location are key ways to divide a network
HTTPS (Secure HTTP)
IRC
UDP

15. Which of the following are true about static and dynamic routing?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Maximum transmission unit
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

16. UDP does or does not create a session?
It is the most common - and it encapsulates transport layer segments
Does not
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

17. How does UDP keep track of sequence numbers?

18. List three network applications that use UDP
TCP
DNS - video-streaming - VoIP
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 and 8

19. What two commands can be used to view a host's 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.
Netstat -r and route print
Ephermeral
FTP

20. What four tasks does the network layer perform?
Dynamic / private
53
It Doesn't - TCP does
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

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

22. How many bits are in an IPv6 address?
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
128
Web browsing - email - file transfer

23. What are three key factors to consider when grouping hosts into a common network?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Purpose - ownership - and geographic location are key ways to divide a network
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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

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

25. MTU stands for ?
Allows the transport layer function on the destination host to reassemble segments in the right order
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Maximum transmission unit
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

26. Which of the following are not functions of the network layer?
The default gateway address is the address of a router interface that is connected to the same network as the host.
Window size
TCP
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

27. 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?
False. It's like a file - only one process can read/write.
Does not
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

28. Port 69 is?
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
TFTP - Trivial File Transfer Protocol
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
HTTPS (Secure HTTP)

29. What is the purpose of sequence numbers?
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
Allows the transport layer function on the destination host to reassemble segments in the right order
TCP

30. 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
All
Gateway
Transport

31. How many bytes of overhead do TCP segments carry? How many does UDP carry?
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
49152 - 65535.
Routers (the subnetting process)
20 and 8

32. TCP is a ________________ layer protocol.
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
It means ensuring that each segment that the source sends arrives at the destination
Maximum transmission unit
Transport

33. Port 520 is?
Destination network - next-hop - metric
Acknowledgment field significant
RIP (Routing Information Protocol)
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

34. SYN is?
Not - these are done by other protocols in other layers
TCP
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
Synchronize sequence numbers

35. TCP header provides for
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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
Static routing
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

36. What is a broadcast domain?
Upper
Allows the transport layer function on the destination host to reassemble segments in the right order
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
Data link - physical

37. 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)
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Gateway
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

38. 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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
49152 - 65535.
Telnet

39. 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.
POP3
TCP
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

40. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
Connectionless - Best effort (unreliable) - media independent
Reliable - connection-oriented protocol (resends if not received)
The default gateway address is the address of a router interface that is connected to the same network as the host.

41. Which of the following are true about network layer encapsulation?
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.
The default gateway address is the address of a router interface that is connected to the same network as the host.
It means ensuring that each segment that the source sends arrives at the destination
TFTP - Trivial File Transfer Protocol

42. IP requires that each sending and receiving device have a __________ IP address.
Synchronize sequence numbers
20 and 8
Unique
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

43. Name the private address blocks
UDP - it sends datagrams as 'best effort'
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
Reliable - connection-oriented protocol (resends if not received)
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

44. List three network applications that use TCP
The source and destination port number
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Web browsing - email - file transfer
POP3

45. On a particular network how would you determine the default gateway address for a host?
RIP (Routing Information Protocol)
The default gateway address is the address of a router interface that is connected to the same network as the host.
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
Connectionless - Best effort (unreliable) - media independent

46. What is the port range for dynamic or private ports
It works the same on all Layer 1 media
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
49152 - 65535.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

47. Dynamic ports fall into what category of port
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
Ephermeral
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

48. Why does TCP use a sequence number in the header?
Allows the transport layer function on the destination host to reassemble segments in the right order
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
Connectionless - Best effort (unreliable) - media independent
POP3

49. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
False. It's like a file - only one process can read/write.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
The source and destination port number
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

50. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
20 and 8
Connectionless
Acknowledgment field significant