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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. How many bytes of overhead do TCP segments carry? How many does UDP carry?
An alternate HTTP port
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
20 and 8
TCP. It makes larger demands on a network

2. Are well known ports registered
TFTP - Trivial File Transfer Protocol
UDP
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

3. Which of the following are true about IP?
To track the different conversations crossing the network at the same time
Allows the transport layer function on the destination host to reassemble segments in the right order
False. It's like a file - only one process can read/write.
It is the most common - and it encapsulates transport layer segments

4. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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.
Gateway
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

5. How does UDP keep track of sequence numbers?

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6. What is a broadcast domain?
Gateway
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.
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
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

7. The three main features of routes in a routing table are?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
1
Destination network - next-hop - metric
User Datagram Protocol

8. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Routing table
Window size
32 - there are four octets of 8 bits each in an IPv4 address
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.

9. UDP does or does not create a session?
Does not
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.
Netstat -r and route print
To track the different conversations crossing the network at the same time

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?
It means ensuring that each segment that the source sends arrives at the destination
Data link - physical
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
TCP uses flow control

11. Port 20 is?
FTP
Connectionless - Best effort (unreliable) - media independent
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
49152 - 65535.

12. During data transfer - What is the receiving host responsible for?
Window size
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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

13. How many bits are in an IPv6 address?
DNS - video-streaming - VoIP
To track the different conversations crossing the network at the same time
128
TFTP - Trivial File Transfer Protocol

14. 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
UDP
Routers (the subnetting process)
The source and destination port number

15. What is the purpose of the ToS field in the IPv4 header?
Packet
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.
False. It's like a file - only one process can read/write.
Web browsing - email - file transfer

16. Port 23 is?
Telnet
Connectionless - Best effort (unreliable) - media independent
The default gateway address is the address of a router interface that is connected to the same network as the host.
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

17. Which of the following are not functions of the network layer?
Packet
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
32 - there are four octets of 8 bits each in an IPv4 address

18. Which of the following are true about network layer encapsulation?
Allows the transport layer function on the destination host to reassemble segments in the right order
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Connectionless - Best effort (unreliable) - media independent
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.

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

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20. What is the proper order of SYN sequence?
Not - these are done by other protocols in other layers
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
It Doesn't - TCP does
RIP (Routing Information Protocol)

21. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Packet
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.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

22. 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?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
UDP - it sends datagrams as 'best effort'
128
32 - there are four octets of 8 bits each in an IPv4 address

23. What information does a router need to successfully forward packets?
128
Synchronize sequence numbers
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
TCP

24. Port 194 is?
Maximum transmission unit
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
IRC
49152 - 65535.

25. MTU stands for ?
Connectionless
It is the most common - and it encapsulates transport layer segments
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Maximum transmission unit

26. Encapsulation occurs at all - some or none of the layers of the OSI model?
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.
Packet
All
128

27. Which protocol ensures more reliable delivery between applications - TCP or UDP?
UDP
TCP. It makes larger demands on a network
Ephermeral
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

28. When the client end of the session has no more data to transfer - it sets the ___________ flag in the header of the segment? (Hint: three-letter acronym)
TCP
Transport
TCP uses flow control
FIN

29. List three network applications that use TCP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
User Datagram Protocol
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
Web browsing - email - file transfer

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

31. Port 69 is?
Connectionless
49152 - 65535.
Transport
TFTP - Trivial File Transfer Protocol

32. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Allows the transport layer function on the destination host to reassemble segments in the right order
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.
SMTP

33. What two commands can be used to view a host's routing table?
Netstat -r and route print
Transport
FIN
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

34. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Connectionless - Best effort (unreliable) - media independent
It Doesn't - TCP does

35. What is the port range for dynamic or private ports
49152 - 65535.
It works the same on all Layer 1 media
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Acknowledgment and reassembly (receipt of packets and putting them in right order)

36. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
TFTP - Trivial File Transfer Protocol
POP3
Ephermeral
Reliable - connection-oriented protocol (resends if not received)

37. On a particular network how would you determine the default gateway address for a host?
UDP
TCP uses flow control
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

38. TCP header provides for
53
UDP - it sends datagrams as 'best effort'
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
49152 - 65535.

39. 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.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Allows the transport layer function on the destination host to reassemble segments in the right order
Data link - physical
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

40. MSN messenger uses 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.
FIN
UDP - it sends datagrams as 'best effort'
TCP

41. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Acknowledgment field significant
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Decapsulation
Routers (the subnetting process)

42. Port 25 is?
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
Packet
TCP
SMTP

43. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Connectionless
FIN
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.
IRC

44. What is the port range for Registered ports
Static routing
20 and 8
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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

45. Which of the following are true about static and dynamic routing?
TCP uses flow control
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
False. It's like a file - only one process can read/write.
Reliable - connection-oriented protocol (resends if not received)

46. Why is IP 'media independent'?
Ephermeral
TFTP - Trivial File Transfer Protocol
It works the same on all Layer 1 media
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

47. Ephermeral port is what type of port
All
Decapsulation
DNS - video-streaming - VoIP
Dynamic / private

48. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
HTTPS (Secure HTTP)
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
It is the most common - and it encapsulates transport layer segments

49. What is the protocol number for UDP?
Telnet
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)
POP3

50. Dynamic ports fall into what category of port
Unique
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.
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
Ephermeral