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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 is the purpose of the ToS field in the IPv4 header?
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
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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.

2. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
TCP. It makes larger demands on a network
Reliable - connection-oriented protocol (resends if not received)
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.
It is the most common - and it encapsulates transport layer segments

3. How many bytes of overhead do TCP segments carry? How many does UDP carry?
20 and 8
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 - Best effort (unreliable) - media independent
HTTPS (Secure HTTP)

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

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5. Dynamic ports fall into what category of port
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
DNS - video-streaming - VoIP
Dynamic / private
Ephermeral

6. What is the purpose of sequence numbers?
Transport
All
Destination network - next-hop - metric
Allows the transport layer function on the destination host to reassemble segments in the right order

7. ACK is?
Acknowledgment field significant
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
TCP uses flow control
32 - there are four octets of 8 bits each in an IPv4 address

8. 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
DNS - video-streaming - VoIP
Synchronize sequence numbers
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

9. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Unique
It is the most common - and it encapsulates transport layer segments
Upper
Routers (the subnetting process)

10. What is the proper order of FIN sequence?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Data link - physical
Acknowledgment field significant
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

11. IP is designed or not designed to track and manage the flow of packets?
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
Data link - physical
It works the same on all Layer 1 media
Not - these are done by other protocols in other layers

12. What four tasks does the network layer perform?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Dynamic / private
Data link - physical
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

13. List three network applications that use UDP
To track the different conversations crossing the network at the same time
DNS - video-streaming - VoIP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
User Datagram Protocol

14. Which of the following are true about network layer encapsulation?
Not - these are done by other protocols in other layers
53
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.
TCP

15. Port 110 is?
All
TCP. It makes larger demands on a network
POP3
Synchronize sequence numbers

16. The value of the ACK number field is equal to the client ISN plus ___________ (number)?
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
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
1

17. Ephermeral port is what type of port
It means ensuring that each segment that the source sends arrives at the destination
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.
Dynamic / private

18. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
Data link - physical
Decapsulation
UDP

19. SYN is?
Synchronize sequence numbers
IRC
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
TCP

20. The router a network uses to send and receive messages beyond the network is called a ___________ router.
20 and 8
Gateway
Allows the transport layer function on the destination host to reassemble segments in the right order
Routing table

21. UDP does or does not create a session?
POP3
Packet
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

22. What two commands can be used to view a host's routing table?
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
20 and 8
Netstat -r and route print
UDP - it sends datagrams as 'best effort'

23. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
Packet
FIN
TCP
Unique

24. What is a broadcast domain?
Reliable - connection-oriented protocol (resends if not received)
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
RIP (Routing Information Protocol)
Connectionless - Best effort (unreliable) - media independent

25. UDP 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.
User Datagram Protocol
An alternate HTTP port
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

26. TCP header provides for
SMTP
The source and destination port number
Allows the transport layer function on the destination host to reassemble segments in the right order
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

27. Port 443 is?
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
UDP - it sends datagrams as 'best effort'
Decapsulation
HTTPS (Secure HTTP)

28. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
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
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Window size
Not - these are done by other protocols in other layers

29. Port 8080 is?
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
An alternate HTTP port
128
To track the different conversations crossing the network at the same time

30. IP requires that each sending and receiving device have a __________ IP address.
POP3
Unique
Reliable - connection-oriented protocol (resends if not received)
False. It's like a file - only one process can read/write.

31. Pieces of information about a route that a routing table contains
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
To track the different conversations crossing the network at the same time

32. Which protocol ensures more reliable delivery between applications - TCP or UDP?
Static routing
TCP. It makes larger demands on a network
TCP
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.

33. Encapsulation occurs at all - some or none of the layers of the OSI model?
DNS - video-streaming - VoIP
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
All
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

34. An example of a communication that sends a letter to someone without notifying the recipient in advance is called?
Connectionless
It works the same on all Layer 1 media
Does not
SMTP

35. Which of the following are true about static and dynamic routing?
RIP (Routing Information Protocol)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
Ephermeral
Synchronize sequence numbers

36. 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
Decapsulation
Upper
FIN

37. MSN messenger uses TCP or UDP?
49152 - 65535.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
TCP. It makes larger demands on a network
TCP

38. In networking terms - What is reliability?
TCP
It means ensuring that each segment that the source sends arrives at the destination
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Upper

39. Port 23 is?
Acknowledgment field significant
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 means ensuring that each segment that the source sends arrives at the destination
Telnet

40. What does segmentation provide to communications?
Packet
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
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

41. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Upper
Forward the packet to the default route interface (gateway) or just drop/discard the packets
All
53

42. What are three key factors to consider when grouping hosts into a common network?
Not - these are done by other protocols in other layers
Purpose - ownership - and geographic location are key ways to divide a network
128
Maximum transmission unit

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

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44. What is the protocol number for UDP?
Web browsing - email - file transfer
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
FIN
Window size

45. Why is IP 'media independent'?
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.
Transport
It works the same on all Layer 1 media
Routers (the subnetting process)

46. What are the three basic characteristics of IPv4?
Gateway
Unique
RIP (Routing Information Protocol)
Connectionless - Best effort (unreliable) - media independent

47. Port 69 is?
The default gateway address is the address of a router interface that is connected to the same network as the host.
TFTP - Trivial File Transfer Protocol
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
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

48. Name the private address blocks
Purpose - ownership - and geographic location are key ways to divide a network
53
Not - these are done by other protocols in other layers
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

49. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
UDP - it sends datagrams as 'best effort'
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
RIP (Routing Information Protocol)
Upper

50. How many bits are in an IPv4 address?
20 and 8
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
32 - there are four octets of 8 bits each in an IPv4 address
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