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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. TCP header provides for
Transport
20 and 8
Source and destination (ports) - Sequencing - Acknowledgement - 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

2. What is the port range for Registered ports
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
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
Telnet
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts

3. What is the purpose of the ToS field in the IPv4 header?
It is the most common - and it encapsulates transport layer segments
RIP (Routing Information Protocol)
Forward the packet to the default route interface (gateway) or just drop/discard the packets
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.

4. Port 443 is?
HTTPS (Secure HTTP)
49152 - 65535.
TCP. It makes larger demands on a network
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.

5. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
DNS - video-streaming - VoIP
20 and 8
HTTPS (Secure HTTP)

6. How many bits are in an IPv6 address?
SMTP
Web browsing - email - file transfer
Netstat -r and route print
128

7. Encapsulation occurs at all - some or none of the layers of the OSI model?
Data link - physical
All
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Connectionless

8. What is the proper order of FIN sequence?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
User Datagram Protocol

9. 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
Does not
20 and 8
Acknowledgment field significant

10. On a particular network how would you determine the default gateway address for a host?
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
Upper
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

11. What are the transport layer's responsibilities?
Data link - physical
It works the same on all Layer 1 media
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
DNS - video-streaming - VoIP

12. In networking terms - What is reliability?
Unique
Acknowledgment field significant
It means ensuring that each segment that the source sends arrives at the destination
Packet

13. Port 20 is?
FTP
Routers (the subnetting process)
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
UDP - it sends datagrams as 'best effort'

14. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Netstat -r and route print
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Web browsing - email - file transfer
Upper

15. UDP does or does not create a session?
RIP (Routing Information Protocol)
Does not
It is the most common - and it encapsulates transport layer segments
It Doesn't - TCP does

16. Routers add routes for the connected networks to their ________________ .
Acknowledgment field significant
Routing table
UDP
Ephermeral

17. IP is designed or not designed to track and manage the flow of packets?
Routing table
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
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer

18. Which of the following are true about network layer encapsulation?
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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.

19. What is the port range for dynamic or private ports
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
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.
User Datagram Protocol
49152 - 65535.

20. What kinds of problems are caused by excessive broadcast traffic on a network segment?
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Ephermeral
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.
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

21. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
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 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
Dynamic / private
Reliable - connection-oriented protocol (resends if not received)

22. What information does a router need to successfully forward packets?
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
Connectionless - Best effort (unreliable) - media independent
53
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

23. The three-way handshake performs what three functions?
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
Web browsing - email - file transfer
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

24. What is the default DNS port number?
53
Data link - physical
FIN
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

25. What is contained in the header of each segment or datagram?
The source and destination port number
Transport
TCP
Dynamic / private

26. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Upper
TCP uses flow control
Routers (the subnetting process)
Packet

27. Dynamic ports fall into what category of port
Ephermeral
Dynamic / private
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
Gateway

28. 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
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
TCP uses flow control
It means ensuring that each segment that the source sends arrives at the destination

29. Which of the following are not functions of the network layer?
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
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
49152 - 65535.

30. During data transfer - What is the receiving host responsible for?
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Acknowledgment and reassembly (receipt of packets and putting them in right order)
128

31. What does segmentation provide to communications?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

32. SYN is?
TCP uses flow control
IRC
TCP
Synchronize sequence numbers

33. Port 520 is?
Acknowledgment field significant
RIP (Routing Information Protocol)
DNS - video-streaming - VoIP
Ephermeral

34. What two commands can be used to view a host's routing table?
Netstat -r and route print
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
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
An alternate HTTP port

35. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
Routing table
UDP - it sends datagrams as 'best effort'
Acknowledgment and reassembly (receipt of packets and putting them in right order)

36. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
128
Synchronize sequence numbers
Decapsulation
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

37. Port 69 is?
Telnet
TFTP - Trivial File Transfer Protocol
FIN
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. The three main features of routes in a routing table are?
TCP uses flow control
Destination network - next-hop - metric
Not - these are done by other protocols in other layers
Routing table

39. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Window size
User Datagram Protocol
Packet
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

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

41. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
Netstat -r and route print
Upper
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
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.

42. What four tasks does the network layer perform?
FTP
An alternate HTTP port
Unique
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

43. Pieces of information about a route that a routing table contains
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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
Allows the transport layer function on the destination host to reassemble segments in the right order
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

44. 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?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Routing table
Static routing

45. Which of the following is true about IP?

46. What is the purpose of TCP/UDP port numbers?
TCP uses flow control
Netstat -r and route print
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.
To track the different conversations crossing the network at the same time

47. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
SMTP
Transport
TCP. It makes larger demands on a network
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

48. Why does TCP use a sequence number in the header?
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
User Datagram Protocol
HTTPS (Secure HTTP)
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.

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

50. Port 194 is?
Upper
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
It works the same on all Layer 1 media
IRC