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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 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)
Purpose - ownership - and geographic location are key ways to divide a network
Static routing
32 - there are four octets of 8 bits each in an IPv4 address

2. Which protocol ensures more reliable delivery between applications - TCP or UDP?
53
Not - these are done by other protocols in other layers
Data link - physical
TCP. It makes larger demands on a network

3. In networking terms - What is reliability?
Unique
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
It means ensuring that each segment that the source sends arrives at the destination

4. The three-way handshake performs what three functions?
Data link - physical
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
Purpose - ownership - and geographic location are key ways to divide a network
Synchronize sequence numbers

5. What is the netstat utility used for on a host?
DNS - video-streaming - VoIP
Ephermeral
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
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

6. During data transfer - What is the receiving host responsible for?
Does not
It Doesn't - TCP does
Telnet
Acknowledgment and reassembly (receipt of packets and putting them in right order)

7. IP requires that each sending and receiving device have a __________ IP address.
Static routing
Unique
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
Upper

8. What is the port range for Registered ports
20 and 8
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
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
Purpose - ownership - and geographic location are key ways to divide a network

9. Which protocol provides connectionless network layer services? IP - TCP - UDB or OSI?
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport layer.
Maximum transmission unit
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
Allows the transport layer function on the destination host to reassemble segments in the right order

10. What are the transport layer's responsibilities?
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
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
POP3

11. Which of the following are true about IP?
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
All
Telnet

12. Why is IP 'media independent'?
Unique
It Doesn't - TCP does
Ephermeral
It works the same on all Layer 1 media

13. What is the purpose of the ToS field in the IPv4 header?
Data link - physical
1
Synchronize sequence numbers
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.

14. How many bytes of overhead do TCP segments carry? How many does UDP carry?
Routers (the subnetting process)
The default gateway address is the address of a router interface that is connected to the same network as the host.
Dynamic / private
20 and 8

15. On a particular network how would you determine the default gateway address for a host?
It Doesn't - TCP does
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 means ensuring that each segment that the source sends arrives at the destination

16. Encapsulation occurs at all - some or none of the layers of the OSI model?
Allows the transport layer function on the destination host to reassemble segments in the right order
All
Gateway
HTTPS (Secure HTTP)

17. What is the port range for dynamic or private ports
Routers (the subnetting process)
Reliable - connection-oriented protocol (resends if not received)
UDP - it sends datagrams as 'best effort'
49152 - 65535.

18. Which of the following are true about static and dynamic routing?
IRC
Unique
Routers (the subnetting process)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

19. Port 194 is?
False. It's like a file - only one process can read/write.
IRC
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
Gateway

20. 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.
Acknowledgment field significant
20 and 8
Data link - physical
Does not

21. 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)
TCP
Unique

22. What does segmentation provide to communications?
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Segmentation provides the means to send and receive data when running multiple applications concurrently on a computer
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.

23. What is the default DNS port number?
53
POP3
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
All

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

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25. MSN messenger uses TCP or UDP?
It works the same on all Layer 1 media
Maximum transmission unit
SMTP
TCP

26. Which of the following are true about network layer encapsulation?
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.
Data link - physical
Does not
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.

27. Port 69 is?
TFTP - Trivial File Transfer Protocol
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
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

28. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
FTP
False. It's like a file - only one process can read/write.
Upper
53

29. What are the three basic characteristics of IPv4?
Connectionless - Best effort (unreliable) - media independent
Destination network - next-hop - metric
Not - these are done by other protocols in other layers
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.

30. When an OSI Layer 4 PDU has been encapsulated at the network layer it is called a ______________.
The default gateway address is the address of a router interface that is connected to the same network as the host.
Packet
Connectionless
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously

31. What four tasks does the network layer perform?
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
Routers (the subnetting process)
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation

32. What is the purpose of TCP/UDP port numbers?
To track the different conversations crossing the network at the same time
Connectionless - Best effort (unreliable) - media independent
TCP
Gateway

33. What is contained in the header of each segment or datagram?
It works the same on all Layer 1 media
The default gateway address is the address of a router interface that is connected to the same network as the host.
The source and destination port number
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

34. Port 25 is?
SMTP
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Packet
It is the most common - and it encapsulates transport layer segments

35. Why does TCP use a sequence number in the header?
Reliable - connection-oriented protocol (resends if not received)
Connectionless
Does not
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

36. List three network applications that use UDP
SMTP
RIP (Routing Information 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.
DNS - video-streaming - VoIP

37. TCP is a ________________ layer protocol.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Web browsing - email - file transfer
Transport
FTP

38. 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)
FIN
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Unique
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

39. End systems use port numbers to select the proper application. What is the lowest port number that can be dynamically assigned by the host system? 1 - 128 - 256 or 1024?
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
The default gateway address is the address of a router interface that is connected to the same network as the host.
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
Allows the transport layer function on the destination host to reassemble segments in the right order

40. What is the name of the process of removing the OSI Layer 2 information from an IP 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
Does not
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
Decapsulation

41. 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
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
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
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

42. The three main features of routes in a routing table are?
Destination network - next-hop - metric
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
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

43. Are well known ports registered
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
Acknowledgment and reassembly (receipt of packets and putting them in right order)
Unique
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.

44. If a router needs to send a packet but doesn't know the next hop or destination network - what can it do?
Decapsulation
1
49152 - 65535.
Forward the packet to the default route interface (gateway) or just drop/discard the packets

45. How many bits are in an IPv4 address?
32 - there are four octets of 8 bits each in an IPv4 address
It works the same on all Layer 1 media
It means ensuring that each segment that the source sends arrives at the destination
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

46. Port 520 is?
Acknowledgment and reassembly (receipt of packets and putting them in right order)
The source and destination port number
RIP (Routing Information Protocol)
SMTP

47. 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
Routers (the subnetting process)
Acknowledgment field significant
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses

48. Which of the following is true about IP?

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49. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
UDP - it sends datagrams as 'best effort'
Forward the packet to the default route interface (gateway) or just drop/discard the packets
Window size

50. List three network applications that use TCP
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 default gateway address is the address of a router interface that is connected to the same network as the host.
TCP
Web browsing - email - file transfer