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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. Why is IP 'media independent'?
It works the same on all Layer 1 media
Unique
Static routing
TCP

2. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
It Doesn't - TCP does
DNS - video-streaming - VoIP
Routing table

3. Which is a connectionless protocol - UDP or TCP?
UDP
Unique
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
TFTP - Trivial File Transfer Protocol

4. Which protocol ensures more reliable delivery between applications - TCP or UDP?
False. It's like a file - only one process can read/write.
Telnet
Acknowledgment field significant
TCP. It makes larger demands on a network

5. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
53
Window size
Routing table

6. Port 20 is?
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
FIN
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
FTP

7. The three main features of routes in a routing table are?
Data link - physical
Destination network - next-hop - metric
Routing table
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

8. List three network applications that use TCP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
POP3
Web browsing - email - file transfer

9. What is the default DNS port number?
53
RIP (Routing Information Protocol)
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
It Doesn't - TCP does

10. Port 25 is?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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
Window size
SMTP

11. Which of the following is true about IP?

12. The three-way handshake performs what three functions?
128
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
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.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

13. Port 443 is?
TCP uses flow control
Window size
Web browsing - email - file transfer
HTTPS (Secure HTTP)

14. Routers add routes for the connected networks to their ________________ .
Routing table
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
Connectionless
FTP

15. What is the port range for well known ports
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
TCP. It makes larger demands on a network
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Unique

16. TCP header provides for
It Doesn't - TCP does
Data link - physical
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
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

17. Which of the following are true about static and dynamic routing?
It works the same on all Layer 1 media
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Data link - physical

18. 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?
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
FIN
Forward the packet to the default route interface (gateway) or just drop/discard the packets
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

19. List three network applications that use UDP
DNS - video-streaming - VoIP
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.
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
Data link - physical

20. SYN is?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Destination network - next-hop - metric
Synchronize sequence numbers
SMTP

21. What kinds of problems are caused by excessive broadcast traffic on a network segment?
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
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)
An alternate HTTP port

22. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
All
IRC
Window size
Data link - physical

23. On a particular network how would you determine the default gateway address for a host?
POP3
Routing table
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
The default gateway address is the address of a router interface that is connected to the same network as the host.

24. 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
Destination network - next-hop - metric
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Not - these are done by other protocols in other layers

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

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

27. 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.
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
Data link - physical
Netstat -r and route print
IRC

28. Are well known ports registered
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Connectionless
Packet

29. Port 23 is?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Telnet
Not - these are done by other protocols in other layers
Window size

30. Which of the following are not functions of the network layer?
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
32 - there are four octets of 8 bits each in an IPv4 address
IRC
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

31. MTU stands for ?
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
Maximum transmission unit
Data link - physical
UDP

32. What is the protocol number for UDP?
Does not
Acknowledgment field significant
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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

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

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

35. 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?
It is the most common - and it encapsulates transport layer segments
TCP uses flow control
Data link - physical
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.

36. What are the transport layer's responsibilities?
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
It Doesn't - TCP does
TCP
20 and 8

37. Dynamic ports fall into what category of port
Connectionless
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Ephermeral
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

38. How many bits are in an IPv4 address?
Gateway
128
Decapsulation
32 - there are four octets of 8 bits each in an IPv4 address

39. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Netstat -r and route print
Destination network - next-hop - metric
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
1

40. What four tasks does the network layer perform?
20 and 8
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
UDP - it sends datagrams as 'best effort'
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

41. How many bits are in an IPv6 address?
128
DNS - video-streaming - VoIP
TCP uses flow control
FIN

42. Pieces of information about a route that a routing table contains
1
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
All
HTTPS (Secure HTTP)

43. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Maximum transmission unit
SMTP
Forward the packet to the default route interface (gateway) or just drop/discard the packets

44. 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
It is the most common - and it encapsulates transport layer segments
Routing table
It works the same on all Layer 1 media

45. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
53

46. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
FIN
TFTP - Trivial File Transfer Protocol
Decapsulation
Connectionless

47. How does UDP keep track of sequence numbers?

48. What does segmentation provide to communications?
Maximum transmission unit
Source and destination (ports) - Sequencing - Acknowledgement - 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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

49. UDP does or does not create a session?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
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
Data link - physical

50. What are three key factors to consider when grouping hosts into a common network?
Purpose - ownership - and geographic location are key ways to divide a network
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
POP3
It works the same on all Layer 1 media