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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. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Connectionless
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Upper

2. What is the proper order of FIN sequence?
Window size
Acknowledgment field significant
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
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

3. Port 443 is?
32 - there are four octets of 8 bits each in an IPv4 address
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
HTTPS (Secure HTTP)

4. Which is a connection-oriented protocol - TCP or UDP?
TFTP - Trivial File Transfer Protocol
Connectionless
TCP
False. It's like a file - only one process can read/write.

5. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Transport
Reliable - connection-oriented protocol (resends if not received)
Maximum transmission unit

6. ACK is?
Acknowledgment field significant
Netstat -r and route print
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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

7. Port 520 is?
It works the same on all Layer 1 media
IRC
RIP (Routing Information Protocol)
Does not

8. What are the transport layer's responsibilities?
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
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
Web browsing - email - file transfer

9. The three main features of routes in a routing table are?
TCP. It makes larger demands on a network
POP3
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Destination network - next-hop - metric

10. The router a network uses to send and receive messages beyond the network is called a ___________ router.
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
It works the same on all Layer 1 media
Gateway

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

12. What is the purpose of the ToS field in the IPv4 header?
Data link - physical
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.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
SMTP

13. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
20 and 8
DNS - video-streaming - VoIP
Static routing

14. What is the protocol number for UDP?
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
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
Packet

15. Port 110 is?
POP3
HTTPS (Secure HTTP)
DNS - video-streaming - VoIP
SMTP

16. Which of the following is true about IP?

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

18. What is the netstat utility used for on a host?
FTP
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
TFTP - Trivial File Transfer Protocol
Netstat -r and route print

19. Why does TCP use a sequence number in the header?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
The default gateway address is the address of a router interface that is connected to the same network as the host.
IRC

20. Pieces of information about a route that a routing table contains
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
Telnet
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

21. 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.
Data link - physical
1
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
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.

22. Port 8080 is?
53
Routers (the subnetting process)
RIP (Routing Information Protocol)
An alternate HTTP port

23. Name the private address blocks
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
DNS - video-streaming - VoIP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Reliable - connection-oriented protocol (resends if not received)

24. On a particular network how would you determine the default gateway address for a 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
The default gateway address is the address of a router interface that is connected to the same network as the host.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Destination network - next-hop - metric

25. What kinds of problems are caused by excessive broadcast traffic on a network segment?
All
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
HTTPS (Secure HTTP)

26. MSN messenger uses TCP or UDP?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
TCP
To track the different conversations crossing the network at the same time
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

27. How many bits are in an IPv6 address?
Ephermeral
It is the most common - and it encapsulates transport layer segments
128
False. It's like a file - only one process can read/write.

28. Which of the following are true about IP?
User Datagram Protocol
53
Reliable - connection-oriented protocol (resends if not received)
It is the most common - and it encapsulates transport layer segments

29. 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
Transport
Ephermeral
Dynamic / private

30. MTU stands for ?
Routing table
Synchronize sequence numbers
49152 - 65535.
Maximum transmission unit

31. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
TCP. It makes larger demands on a network
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Static routing
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

32. Encapsulation occurs at all - some or none of the layers of the OSI model?
All
Acknowledgment field significant
DNS - video-streaming - VoIP
Data link - physical

33. 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?
FTP
TCP uses flow control
IRC
Packet

34. What is the default DNS port number?
Acknowledgment field significant
UDP - it sends datagrams as 'best effort'
53
Destination network - next-hop - metric

35. SYN 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
Maximum transmission unit
Static routing
Synchronize sequence numbers

36. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
1
Static routing
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.

37. Port 25 is?
It Doesn't - TCP does
SMTP
Packet
Synchronize sequence numbers

38. What is the port range for well known ports
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Gateway
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Upper

39. Why is IP 'media independent'?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
It works the same on all Layer 1 media
It means ensuring that each segment that the source sends arrives at the destination
All

40. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
SMTP
Connectionless
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Ephermeral

41. Which protocol ensures more reliable delivery between applications - TCP or UDP?
To track the different conversations crossing the network at the same time
Unique
TCP. It makes larger demands on a network
49152 - 65535.

42. What is the purpose of sequence numbers?
Web browsing - email - file transfer
Synchronize sequence numbers
Allows the transport layer function on the destination host to reassemble segments in the right order
FTP

43. List three network applications that use UDP
Synchronize sequence numbers
DNS - video-streaming - VoIP
Unique
It is the most common - and it encapsulates transport layer segments

44. How does UDP keep track of sequence numbers?

45. What is a broadcast domain?
Routers (the subnetting process)
Web browsing - email - file transfer
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

46. What four tasks does the network layer perform?
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
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
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

47. 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?
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
53
Not - these are done by other protocols in other layers
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

48. Are well known ports registered
32 - there are four octets of 8 bits each in an IPv4 address
Upper
It works the same on all Layer 1 media
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

49. Which of the following are true about network layer encapsulation?
Unique
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.
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.
It means ensuring that each segment that the source sends arrives at the destination

50. What is the port range for dynamic or private ports
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.
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
49152 - 65535.
Decapsulation