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Cisco Network Fundamentals - 2

Instructions:

Answer 50 questions in 15 minutes.
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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 name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
The source and destination port number
FTP
Purpose - ownership - and geographic location are key ways to divide a network

2. Which of the following is true about IP?

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3. Pieces of information about a route that a routing table contains
UDP - it sends datagrams as 'best effort'
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.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

4. Why does TCP use a sequence number in the header?
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
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Data link - physical

5. 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.
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
An alternate HTTP port
TCP. It makes larger demands on a network
Data link - physical

6. Name the private address blocks
RIP (Routing Information Protocol)
Allows the transport layer function on the destination host to reassemble segments in the right order
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
Purpose - ownership - and geographic location are key ways to divide a network

7. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Upper
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Not - these are done by other protocols in other layers

8. Which of the following are true about network layer encapsulation?
Connectionless - Best effort (unreliable) - media independent
Upper
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 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.

9. Port 20 is?
Web browsing - email - file transfer
FTP
TCP. It makes larger demands on a network
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

10. Port 8080 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
UDP - it sends datagrams as 'best effort'
TCP
An alternate HTTP port

11. 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?
1
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TCP uses flow control
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

12. Port 69 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
TFTP - Trivial File Transfer Protocol
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
20 and 8

13. Which of the following are true about static and dynamic routing?
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
User Datagram Protocol
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Transport

14. Port 110 is?
Transport
POP3
Data link - physical
128

15. The three main features of routes in a routing table are?
Netstat -r and route print
Destination network - next-hop - metric
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Ephermeral

16. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
Netstat -r and route print
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
1
All

17. List three network applications that use UDP
TFTP - Trivial File Transfer Protocol
The source and destination port number
Routing table
DNS - video-streaming - VoIP

18. During data transfer - What is the receiving host responsible for?
All
Acknowledgment and reassembly (receipt of packets and putting them in 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.
User Datagram Protocol

19. Which of the following are not functions of the network layer?
Acknowledgment field significant
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
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

20. What does segmentation provide to communications?
53
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

21. How many bits are in an IPv4 address?
User Datagram Protocol
Destination network - next-hop - metric
The default gateway address is the address of a router interface that is connected to the same network as the host.
32 - there are four octets of 8 bits each in an IPv4 address

22. Why is IP 'media independent'?
Routing table
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.
Forward the packet to the default route interface (gateway) or just drop/discard the packets
It works the same on all Layer 1 media

23. Port 23 is?
Telnet
Allows the transport layer function on the destination host to reassemble segments in the right order
The source and destination port number
DNS - video-streaming - VoIP

24. What is the protocol number for UDP?
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
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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
53

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

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26. IP requires that each sending and receiving device have a __________ IP address.
Allows the transport layer function on the destination host to reassemble segments in the right order
Acknowledgment field significant
Unique
Static routing

27. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
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
Window size
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
To track the different conversations crossing the network at the same time

28. MTU stands for ?
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.
Connectionless
Maximum transmission unit
It is the most common - and it encapsulates transport layer segments

29. ACK is?
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Reliable - connection-oriented protocol (resends if not received)
128
Acknowledgment field significant

30. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
User Datagram 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.
Gateway
Forward the packet to the default route interface (gateway) or just drop/discard the packets

31. Which of the following are true about IP?
It is the most common - and it encapsulates transport layer segments
Maximum transmission unit
49152 - 65535.
Reliable - connection-oriented protocol (resends if not received)

32. UDP does or does not create a session?
Telnet
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
Does not
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

33. What two commands can be used to view a host's routing table?
Netstat -r and route print
Static routing
49152 - 65535.
FIN

34. TCP is a ________________ layer protocol.
Transport
TCP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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

35. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Data link - physical
TCP. It makes larger demands on a network
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Routing table

36. What is the proper order of SYN sequence?
It means ensuring that each segment that the source sends arrives at the destination
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
It Doesn't - TCP does
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #

37. What is the purpose of TCP/UDP port numbers?
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.
All
To track the different conversations crossing the network at the same time
It means ensuring that each segment that the source sends arrives at the destination

38. Encapsulation occurs at all - some or none of the layers of the OSI model?
20 and 8
Decapsulation
All
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

39. The three-way handshake performs what three functions?
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
It is the most common - and it encapsulates transport layer segments
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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

40. Routers add routes for the connected networks to their ________________ .
TFTP - Trivial File Transfer Protocol
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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
Routing table

41. Which is a connectionless protocol - UDP or 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
FIN
UDP
Ephermeral

42. Port 194 is?
Destination network - next-hop - metric
RIP (Routing Information Protocol)
IRC
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

43. What is the purpose of the ToS field in the IPv4 header?
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.
128
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
An alternate HTTP port

44. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
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.
Gateway
Packet

45. 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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Purpose - ownership - and geographic location are key ways to divide a network
The source and destination port number

46. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
IRC
Web browsing - email - file transfer
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Connectionless

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

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48. On a particular network how would you determine the default gateway address for a host?
It means ensuring that each segment that the source sends arrives at the destination
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
The default gateway address is the address of a router interface that is connected to the same network as the host.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

49. What are the three basic characteristics of IPv4?
Does not
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
Connectionless - Best effort (unreliable) - media independent
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

50. Routes to remote networks with the associated next-hops can be manually configured on the router. What is the same for this type of routing?
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.
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
Forward the packet to the default route interface (gateway) or just drop/discard the packets