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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. Dynamic ports fall into what category of port
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Ephermeral
1
Synchronize sequence numbers

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

3. Name the private address blocks
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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
POP3

4. Port 8080 is?
An alternate HTTP port
Allows the transport layer function on the destination host to reassemble segments in the right order
Web browsing - email - file transfer
Routers (the subnetting process)

5. Port 520 is?
RIP (Routing Information Protocol)
53
Allows the transport layer function on the destination host to reassemble segments in the right order
Routing table

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

7. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
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
Web browsing - email - file transfer
Upper

8. What is the protocol number for UDP?
TCP. It makes larger demands on a network
An alternate HTTP port
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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

9. How many bits are in an IPv4 address?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
32 - there are four octets of 8 bits each in an IPv4 address
TFTP - Trivial File Transfer Protocol
The default gateway address is the address of a router interface that is connected to the same network as the host.

10. 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?
Destination network - next-hop - metric
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
RIP (Routing Information Protocol)
To track the different conversations crossing the network at the same time

11. Encapsulation occurs at all - some or none of the layers of the OSI model?
An alternate HTTP port
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 means ensuring that each segment that the source sends arrives at the destination
All

12. During data transfer - What is the receiving host responsible for?
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
Maximum transmission unit
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Dynamic / private

13. Port 25 is?
SMTP
Upper
FTP
32 - there are four octets of 8 bits each in an IPv4 address

14. What is the proper order of SYN sequence?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Decapsulation
UDP
Static routing

15. Which of the following is true about IP?

16. What is the default DNS port number?
Static routing
53
IRC
FIN

17. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Unique
Routers (the subnetting process)
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

18. What is contained in the header of each segment or datagram?
Connectionless - Best effort (unreliable) - media independent
The source and destination port number
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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

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.
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.
Reliable - connection-oriented protocol (resends if not received)
FTP

20. 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
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 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.
It works the same on all Layer 1 media

21. What two commands can be used to view a host's routing table?
User Datagram Protocol
Netstat -r and route print
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
It Doesn't - TCP does

22. UDP stands for?
Purpose - ownership - and geographic location are key ways to divide a network
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Routing table
User Datagram Protocol

23. List three network applications that use TCP
Data link - physical
UDP - it sends datagrams as 'best effort'
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
Web browsing - email - file transfer

24. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Netstat -r and route print
TCP. It makes larger demands on a network
POP3
Acknowledgment field significant

25. On a particular network how would you determine the default gateway address for a host?
SMTP
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
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.

26. What is the port range for well known ports
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Allows the transport layer function on the destination host to reassemble segments in the right order
DNS - video-streaming - VoIP
RIP (Routing Information Protocol)

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

28. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
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.
Connectionless
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
The source and destination port number

29. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
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
Data link - physical
Window size

30. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
TCP uses flow control
Does not
Reliable - connection-oriented protocol (resends if not received)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

31. What are the transport layer's responsibilities?
IRC
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
The default gateway address is the address of a router interface that is connected to the same network as the host.
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. Why does TCP use a sequence number in the header?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
The source and destination port number
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
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

33. Which is a connection-oriented protocol - TCP or UDP?
Routing table
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
TCP
The default gateway address is the address of a router interface that is connected to the same network as the host.

34. What is the port range for dynamic or private ports
49152 - 65535.
Dynamic / private
Telnet
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

35. MSN messenger uses TCP or UDP?
Maximum transmission unit
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.
Web browsing - email - file transfer
TCP

36. Port 69 is?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
TFTP - Trivial File Transfer Protocol
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

37. Port 23 is?
User Datagram Protocol
Telnet
Not - these are done by other protocols in other layers
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

38. What kinds of problems are caused by excessive broadcast traffic on a network segment?
IRC
Netstat -r and route print
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Synchronize sequence numbers

39. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
32 - there are four octets of 8 bits each in an IPv4 address
Maximum transmission unit
An alternate HTTP port

40. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
TCP. It makes larger demands on a network
Synchronize sequence numbers
Allows the transport layer function on the destination host to reassemble segments in the right order
1

41. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
UDP - it sends datagrams as 'best effort'
Web browsing - email - file transfer
Upper
Static routing

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

43. IP requires that each sending and receiving device have a __________ IP address.
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.
20 and 8
Unique
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

44. Port 194 is?
It means ensuring that each segment that the source sends arrives at the destination
All
32 - there are four octets of 8 bits each in an IPv4 address
IRC

45. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
20 and 8
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
1

46. Are well known ports registered
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

47. Port 110 is?
The source and destination port number
TCP
Upper
POP3

48. TCP is a ________________ layer protocol.
POP3
20 and 8
Transport
The default gateway address is the address of a router interface that is connected to the same network as the host.

49. Why is IP 'media independent'?
Static routing
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
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

50. Which of the following are true about network layer encapsulation?
It means ensuring that each segment that the source sends arrives at the destination
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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.
Maximum transmission unit