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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 protocol number for UDP?
Data link - physical
Window size
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
False. It's like a file - only one process can read/write.

2. How does UDP keep track of sequence numbers?

3. What are the transport layer's responsibilities?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
It is the most common - and it encapsulates transport layer segments
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

4. In networking terms - What is reliability?
It means ensuring that each segment that the source sends arrives at the destination
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
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.

5. Port 20 is?
HTTPS (Secure HTTP)
FTP
Dynamic / private
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

6. TCP is a ________________ layer protocol.
Transport
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

7. List three network applications that use TCP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Web browsing - email - file transfer
False. It's like a file - only one process can read/write.
Synchronize sequence numbers

8. Routers add routes for the connected networks to their ________________ .
The default gateway address is the address of a router interface that is connected to the same network as the host.
Upper
Routing table
Netstat -r and route print

9. 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.
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
TFTP - Trivial File Transfer Protocol
Data link - physical

10. Port 520 is?
49152 - 65535.
RIP (Routing Information Protocol)
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.
Ephermeral

11. What is the default DNS port number?
The source and destination port number
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
53
All

12. Which protocol ensures more reliable delivery between applications - TCP or UDP?
It Doesn't - TCP does
POP3
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
TCP. It makes larger demands on a network

13. Pieces of information about a route that a routing table contains
Connectionless - Best effort (unreliable) - media independent
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
To track the different conversations crossing the network at the same time
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

14. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Window size
The source and destination port number
TCP
Upper

15. List three network applications that use UDP
Routers (the subnetting process)
Packet
IRC
DNS - video-streaming - VoIP

16. Which of the following are not functions of the network layer?
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
Static routing
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

17. Which of the following are true about network layer encapsulation?
20 and 8
Transport
RIP (Routing Information Protocol)
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.

18. Why does TCP use a sequence number in the header?
It works the same on all Layer 1 media
UDP
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
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

19. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
TCP
Allows the transport layer function on the destination host to reassemble segments in the right order
20 and 8
Routers (the subnetting process)

20. Which is a connection-oriented protocol - TCP or UDP?
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.
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
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.
TCP

21. What is the port range for dynamic or private ports
49152 - 65535.
Data link - physical
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
32 - there are four octets of 8 bits each in an IPv4 address

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

23. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
Reliable - connection-oriented protocol (resends if not received)
Routers (the subnetting process)

24. What is the purpose of TCP/UDP port numbers?
User Datagram Protocol
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.
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

25. Encapsulation occurs at all - some or none of the layers of the OSI model?
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
All
Ephermeral

26. The three-way handshake performs what three functions?
Telnet
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
Web browsing - email - file transfer
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

27. What is the purpose of the ToS field in the IPv4 header?
DNS - video-streaming - VoIP
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
UDP

28. What is the purpose of sequence numbers?
Allows the transport layer function on the destination host to reassemble segments in the right order
Connectionless - Best effort (unreliable) - media independent
All
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

29. On a particular network how would you determine the default gateway address for a host?
The source and destination port number
The default gateway address is the address of a router interface that is connected to the same network as the host.
Reliable - connection-oriented protocol (resends if not received)
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.

30. Port 443 is?
Dynamic / private
HTTPS (Secure HTTP)
Upper
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.

31. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
Synchronize sequence numbers
Transport
All

32. What does segmentation provide to communications?
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
It works the same on all Layer 1 media
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. Which of the following are true about IP?
All
UDP - it sends datagrams as 'best effort'
It is the most common - and it encapsulates transport layer segments
Gateway

34. How many bits are in an IPv4 address?
20 and 8
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
32 - there are four octets of 8 bits each in an IPv4 address
Routing table

35. 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?
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
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)

36. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Synchronize sequence numbers
Packet
UDP
Acknowledgment and reassembly (receipt of packets and putting them in right order)

37. MSN messenger uses TCP or UDP?
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.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
TCP
Does not

38. What is a broadcast domain?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
It means ensuring that each segment that the source sends arrives at the destination
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
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

39. What is the netstat utility used for on a host?
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 is the most common - and it encapsulates transport layer segments
Reliable - connection-oriented protocol (resends if not received)
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

40. SYN is?
Synchronize sequence numbers
TFTP - Trivial File Transfer Protocol
It Doesn't - TCP does
Upper

41. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
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.
Connectionless
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
User Datagram Protocol

42. 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?
Upper
TCP uses flow control
49152 - 65535.
The source and destination port number

43. 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 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
Acknowledgment field significant

44. What four tasks does the network layer perform?
Upper
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
All
Data link - physical

45. Port 110 is?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Window size
POP3
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

46. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Allows the transport layer function on the destination host to reassemble segments in the right order
20 and 8
Gateway
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

47. Port 25 is?
Netstat -r and route print
SMTP
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Data link - physical

48. Which is a connectionless protocol - UDP or TCP?
20 and 8
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
UDP
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

49. What is the proper order of SYN sequence?
It means ensuring that each segment that the source sends arrives at the destination
Acknowledgment and reassembly (receipt of packets and putting them in right order)
The default gateway address is the address of a router interface that is connected to the same network as the host.
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

50. UDP does or does not create a session?
Allows the transport layer function on the destination host to reassemble segments in the right order
Decapsulation
POP3
Does not