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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. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Window size
It works the same on all Layer 1 media
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TCP

2. What are the three basic characteristics of IPv4?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Connectionless - Best effort (unreliable) - media independent
IRC
FIN

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

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4. Port 25 is?
Allows the transport layer function on the destination host to reassemble segments in the right order
49152 - 65535.
It is the most common - and it encapsulates transport layer segments
SMTP

5. What are three key factors to consider when grouping hosts into a common network?
Transport
Purpose - ownership - and geographic location are key ways to divide a network
Routers (the subnetting process)
TFTP - Trivial File Transfer Protocol

6. MTU stands for ?
It Doesn't - TCP does
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
Maximum transmission unit
Window size

7. TCP is a ________________ layer protocol.
Gateway
Transport
Connectionless - Best effort (unreliable) - media independent
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

8. What does segmentation provide to communications?
HTTPS (Secure HTTP)
Routing table
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Reliable - connection-oriented protocol (resends if not received)

9. Encapsulation occurs at all - some or none of the layers of the OSI model?
The source and destination port number
Dynamic / private
All
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

10. What is the proper order of FIN sequence?
Dynamic / private
User Datagram Protocol
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)

11. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Routing table
20 and 8
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

12. What is the port range for Registered ports
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
POP3
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

13. The router a network uses to send and receive messages beyond the network is called a ___________ router.
Gateway
TCP uses flow control
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

14. How many bits are in an IPv6 address?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
20 and 8
128
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.

15. Port 69 is?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
TFTP - Trivial File Transfer Protocol
FTP
20 and 8

16. What is the purpose of the ToS field in the IPv4 header?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP 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.
Routing table
UDP - it sends datagrams as 'best effort'

17. Why is IP 'media independent'?
It works the same on all Layer 1 media
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
It means ensuring that each segment that the source sends arrives at the destination

18. IP requires that each sending and receiving device have a __________ IP address.
It means ensuring that each segment that the source sends arrives at the destination
Unique
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
TFTP - Trivial File Transfer Protocol

19. Which of the following are not functions of the network layer?
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.
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)
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

20. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
FTP
Acknowledgment and reassembly (receipt of packets and putting them in right order)

21. TCP header provides for
20 and 8
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
All

22. Port 194 is?
Purpose - ownership - and geographic location are key ways to divide a network
Static routing
IRC
FIN

23. 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?
TCP
Static routing
DNS - video-streaming - VoIP
TFTP - Trivial File Transfer Protocol

24. 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
Packet
FTP
It is the most common - and it encapsulates transport layer segments

25. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Routers (the subnetting process)
Ephermeral
Dynamic / private
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

26. Port 520 is?
DNS - video-streaming - VoIP
Packet
RIP (Routing Information Protocol)
All

27. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Decapsulation
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
Routers (the subnetting process)
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

28. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Web browsing - email - file transfer
The source and destination port number
False. It's like a file - only one process can read/write.
TCP. It makes larger demands on a network

29. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
User Datagram Protocol
1
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

30. IP is designed or not designed to track and manage the flow of packets?
Not - these are done by other protocols in other layers
To track the different conversations crossing the network at the same time
Upper
It Doesn't - TCP does

31. What are the transport layer's responsibilities?
Connectionless
POP3
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
The source and destination port number

32. During data transfer - What is the receiving host responsible for?
TCP
TCP
An alternate HTTP port
Acknowledgment and reassembly (receipt of packets and putting them in right order)

33. What is a broadcast domain?
Maximum transmission unit
Synchronize sequence numbers
POP3
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

34. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Allows the transport layer function on the destination host to reassemble segments in the right order
TCP
Packet
It works the same on all Layer 1 media

35. What two commands can be used to view a host's routing table?
Netstat -r and route print
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Allows the transport layer function on the destination host to reassemble segments in the right order
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

36. Which is a connection-oriented protocol - TCP or UDP?
It Doesn't - TCP does
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.
TCP
Transport

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

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38. 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.
Upper
It is the most common - and it encapsulates transport layer segments
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Data link - physical

39. Ephermeral port is what type of port
TCP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Dynamic / private
Routing table

40. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Not - these are done by other protocols in other layers
TCP
Forward the packet to the default route interface (gateway) or just drop/discard the packets
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

41. List three network applications that use UDP
32 - there are four octets of 8 bits each in an IPv4 address
Static routing
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
DNS - video-streaming - VoIP

42. Port 20 is?
Dynamic / private
Transport
Maximum transmission unit
FTP

43. Dynamic ports fall into what category of port
An alternate HTTP port
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
TCP
Ephermeral

44. Which is a connectionless protocol - UDP or TCP?
UDP
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
The source and destination port number
49152 - 65535.

45. UDP does or does not create a session?
It means ensuring that each segment that the source sends arrives at the destination
Decapsulation
TCP uses flow control
Does not

46. What four tasks does the network layer perform?
To track the different conversations crossing the network at the same time
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
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
It Doesn't - TCP does

47. Pieces of information about a route that a routing table contains
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Transport
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Synchronize sequence numbers

48. What is the protocol number for UDP?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
SMTP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Dynamic / private

49. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
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
UDP - it sends datagrams as 'best effort'
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

50. The three main features of routes in a routing table are?
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
HTTPS (Secure HTTP)
Destination network - next-hop - metric
Unique