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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 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
TCP. It makes larger demands on a network
TCP
FIN

2. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Reliable - connection-oriented protocol (resends if not received)
It Doesn't - TCP does
Window size

3. TCP is a ________________ layer 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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Transport
Reliable - connection-oriented protocol (resends if not received)

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

5. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
49152 - 65535.
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
Connectionless

6. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Telnet
Connectionless
Allows the transport layer function on the destination host to reassemble segments in the right order
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

7. Which of the following are true about static and dynamic routing?
SMTP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Connectionless
Does not

8. Pieces of information about a route that a routing table contains
20 and 8
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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
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. What is the default DNS port number?
Forward the packet to the default route interface (gateway) or just drop/discard the packets
UDP
53
Static routing

10. SYN is?
Synchronize sequence numbers
RIP (Routing Information Protocol)
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

11. List three network applications that use 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.
Routers (the subnetting process)
DNS - video-streaming - VoIP
Maximum transmission unit

12. Port 20 is?
Gateway
Packet
FTP
False. It's like a file - only one process can read/write.

13. UDP does or does not create a session?
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
TFTP - Trivial File Transfer Protocol
Transport

14. On a particular network how would you determine the default gateway address for a host?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
SMTP
The default gateway address is the address of a router interface that is connected to the same network as the host.

15. What is the proper order of FIN sequence?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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
Telnet

16. What four tasks does the network layer perform?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
It means ensuring that each segment that the source sends arrives at the destination
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
53

17. MTU stands for ?
Maximum transmission unit
Allows the transport layer function on the destination host to reassemble segments in the 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
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.

18. How many bits are in an IPv4 address?
The source and destination port number
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
All
32 - there are four octets of 8 bits each in an IPv4 address

19. What kinds of problems are caused by excessive broadcast traffic on a network segment?
It works the same on all Layer 1 media
TCP
Window size
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

20. What does segmentation provide to communications?
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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.

21. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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
FTP
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Reliable - connection-oriented protocol (resends if not received)

22. Ephermeral port is what type of port
Forward the packet to the default route interface (gateway) or just drop/discard the packets
False. It's like a file - only one process can read/write.
Dynamic / private
Destination network - next-hop - metric

23. Port 110 is?
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 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
Packet
POP3

24. What is the purpose of the ToS field in the IPv4 header?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Gateway
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.

25. Port 69 is?
To track the different conversations crossing the network at the same time
TFTP - Trivial File Transfer Protocol
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Maximum transmission unit

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

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27. Encapsulation occurs at all - some or none of the layers of the OSI model?
Decapsulation
All
TFTP - Trivial File Transfer Protocol
HTTPS (Secure HTTP)

28. Port 8080 is?
It means ensuring that each segment that the source sends arrives at the destination
An alternate HTTP port
UDP - it sends datagrams as 'best effort'
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

29. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Netstat -r and route print
TCP. It makes larger demands on a network
All
Decapsulation

30. Which is a connection-oriented protocol - TCP or UDP?
TCP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Allows the transport layer function on the destination host to reassemble segments in the right order
FTP

31. Port 25 is?
32 - there are four octets of 8 bits each in an IPv4 address
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
SMTP
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

32. What is the netstat utility used for on a host?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

33. IP is designed or not designed to track and manage the flow of packets?
Data link - physical
It works the same on all Layer 1 media
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Not - these are done by other protocols in other layers

34. Which of the following are true about IP?
SMTP
It is the most common - and it encapsulates transport layer segments
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Connectionless

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

36. Why does TCP use a sequence number in the header?
An alternate HTTP port
IRC
Destination network - next-hop - metric
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

37. MSN messenger uses TCP or UDP?
Connectionless - Best effort (unreliable) - media independent
TCP
FIN
RIP (Routing Information Protocol)

38. The three-way handshake performs what three functions?
Destination network - next-hop - metric
Connectionless
Telnet
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

39. Port 194 is?
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
IRC
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Upper

40. 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.
TCP
Data link - physical
TFTP - Trivial File Transfer Protocol

41. Port 443 is?
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
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
HTTPS (Secure HTTP)
User Datagram Protocol

42. List three network applications that use TCP
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
Web browsing - email - file transfer
Data link - physical
Connectionless

43. 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?
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
53
Synchronize sequence numbers
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

44. IP requires that each sending and receiving device have a __________ IP address.
Synchronize sequence numbers
Unique
Connectionless - Best effort (unreliable) - media independent
RIP (Routing Information Protocol)

45. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
The default gateway address is the address of a router interface that is connected to the same network as the host.
20 and 8
Routers (the subnetting process)
Reliable - connection-oriented protocol (resends if not received)

46. What is a broadcast domain?
DNS - video-streaming - VoIP
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
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
Reliable - connection-oriented protocol (resends if not received)

47. 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)
FIN
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
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

48. Port 23 is?
It Doesn't - TCP does
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
UDP
Telnet

49. ACK is?
Acknowledgment field significant
Not - these are done by other protocols in other layers
It is the most common - and it encapsulates transport layer segments
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

50. Which of the following is true about IP?

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