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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. Name the private address blocks
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
Decapsulation
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.
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

2. How many bytes of overhead do TCP segments carry? How many does UDP carry?
20 and 8
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
UDP - it sends datagrams as 'best effort'
Gateway

3. 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?
TCP uses flow control
Maximum transmission unit
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.

4. Port 25 is?
Allows the transport layer function on the destination host to reassemble segments in the right order
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.
SMTP
IRC

5. List three network applications that use TCP
Window size
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Web browsing - email - file transfer
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

6. Are well known ports registered
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
Unique
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
It is the most common - and it encapsulates transport layer segments

7. IP requires that each sending and receiving device have a __________ IP address.
Unique
Ephermeral
Static routing
20 and 8

8. Port 8080 is?
It Doesn't - TCP does
An alternate HTTP port
UDP - it sends datagrams as 'best effort'
IRC

9. TCP header provides for
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
TCP
UDP - it sends datagrams as 'best effort'

10. What is the netstat utility used for on a host?
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
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
The default gateway address is the address of a router interface that is connected to the same network as the host.
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

11. Encapsulation occurs at all - some or none of the layers of the OSI model?
Routing table
All
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
To track the different conversations crossing the network at the same time

12. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Ephermeral
Decapsulation
TCP. It makes larger demands on a network

13. Which of the following are true about static and dynamic routing?
UDP - it sends datagrams as 'best effort'
Acknowledgment field significant
FTP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

14. TCP is a ________________ layer protocol.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Transport
Netstat -r and route print
Upper

15. 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)
Not - these are done by other protocols in other layers
FIN
Reliable - connection-oriented protocol (resends if not received)
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

16. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
Telnet
POP3
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

17. What is the purpose of the ToS field in the IPv4 header?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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.
49152 - 65535.
Telnet

18. Routers add routes for the connected networks to their ________________ .
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
Transport
Reliable - connection-oriented protocol (resends if not received)
Routing table

19. UDP does or does not create a session?
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
It is the most common - and it encapsulates transport layer segments
Does not
Acknowledgment and reassembly (receipt of packets and putting them in right order)

20. Ephermeral port is what type of port
All
UDP
Static routing
Dynamic / private

21. The three-way handshake performs what three functions?
It Doesn't - TCP does
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
POP3

22. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Web browsing - email - file transfer
TCP. It makes larger demands on a network
Ephermeral
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

23. What is the proper order of SYN sequence?
TCP
Not - these are done by other protocols in other layers
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Data link - physical

24. IP is designed or not designed to track and manage the flow of packets?
Maximum transmission unit
Not - these are done by other protocols in other layers
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
FTP

25. What does segmentation provide to communications?
Not - these are done by other protocols in other layers
It Doesn't - TCP does
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

26. On a particular network how would you determine the default gateway address for a host?
Static routing
FTP
The default gateway address is the address of a router interface that is connected to the same network as the host.
1

27. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
It is the most common - and it encapsulates transport layer segments
The default gateway address is the address of a router interface that is connected to the same network as the host.
It works the same on all Layer 1 media
Window size

28. Why does TCP use a sequence number in the header?
It is the most common - and it encapsulates transport layer segments
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
TCP. It makes larger demands on a network
53

29. 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
Acknowledgment and reassembly (receipt of packets and putting them in right order)
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation

30. MSN messenger uses TCP or UDP?
SMTP
TCP
FIN
Telnet

31. How does UDP keep track of sequence numbers?

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32. What information does a router need to successfully forward packets?
128
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
To track the different conversations crossing the network at the same time
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

33. How many bits are in an IPv4 address?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Telnet
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
32 - there are four octets of 8 bits each in an IPv4 address

34. Which is a connection-oriented protocol - TCP or UDP?
The source and destination port number
Routing table
Transport
TCP

35. SYN is?
UDP - it sends datagrams as 'best effort'
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Synchronize sequence numbers
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

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

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37. Which of the following are true about network layer encapsulation?
Acknowledgment field significant
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.
20 and 8
Destination network - next-hop - metric

38. Which of the following are not functions of the network layer?
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
Window size
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.
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

39. What is the port range for dynamic or private ports
Forward the packet to the default route interface (gateway) or just drop/discard the packets
32 - there are four octets of 8 bits each in an IPv4 address
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
49152 - 65535.

40. How many bits are in an IPv6 address?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
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
TCP
128

41. What are three key factors to consider when grouping hosts into a common network?
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
UDP
Purpose - ownership - and geographic location are key ways to divide a network

42. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Upper
POP3
Telnet
It Doesn't - TCP does

43. What four tasks does the network layer perform?
53
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Destination network - next-hop - metric
Netstat -r and route print

44. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
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
An alternate HTTP port
UDP - it sends datagrams as 'best effort'

45. The three main features of routes in a routing table are?
32 - there are four octets of 8 bits each in an IPv4 address
Destination network - next-hop - metric
Does not
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

46. Which is a connectionless protocol - UDP or TCP?
FIN
User Datagram Protocol
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
UDP

47. What is a broadcast domain?
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
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

48. Port 443 is?
FTP
HTTPS (Secure HTTP)
Static routing
Web browsing - email - file transfer

49. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
It works the same on all Layer 1 media
Transport
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

50. List three network applications that use UDP
DNS - video-streaming - VoIP
Reliable - connection-oriented protocol (resends if not received)
Upper
FTP