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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. Are well known ports registered
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.
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

2. What is a broadcast domain?
Ephermeral
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
Connectionless
TCP

3. MTU stands for ?
SMTP
Purpose - ownership - and geographic location are key ways to divide a network
Ephermeral
Maximum transmission unit

4. How many bytes of overhead do TCP segments carry? How many does UDP carry?
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
20 and 8

5. 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?
Routers (the subnetting process)
Synchronize sequence numbers
TCP uses flow control
128

6. What is the name of the process of removing the OSI Layer 2 information from an IP packet?
Decapsulation
All
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
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.

7. List three network applications that use UDP
Decapsulation
Synchronize sequence numbers
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)

8. What four tasks does the network layer perform?
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
DNS - video-streaming - VoIP
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

9. TCP header provides for
Packet
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Ephermeral
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

10. When an IP packet is decapsulated - the information in the packet is handed to the upper or lower layers for delivery and processing?
User Datagram Protocol
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Static routing
Upper

11. Which of the following are true about network layer encapsulation?
0 - 1023 (total of 1024). The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses
UDP
Does not
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.

12. What is the purpose of TCP/UDP port numbers?
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
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
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
To track the different conversations crossing the network at the same time

13. During data transfer - What is the receiving host responsible for?
Allows the transport layer function on the destination host to reassemble segments in the right order
Upper
All
Acknowledgment and reassembly (receipt of packets and putting them in right order)

14. Which of the following are not functions of the network layer?
RIP (Routing Information Protocol)
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
Addressing packets with IP addresses - Encapsulation - Routing - Decapsulation
Transport

15. What two commands can be used to view a host's routing table?
Netstat -r and route print
32 - there are four octets of 8 bits each in an IPv4 address
IRC
User Datagram Protocol

16. Why is IP 'media independent'?
53
It works the same on all Layer 1 media
All
DNS - video-streaming - VoIP

17. Routers add routes for the connected networks to their ________________ .
Routing table
128
To track the different conversations crossing the network at the same time
UDP - it sends datagrams as 'best effort'

18. Determines how much data a sending host running TCP/IP can transmit before it must receive an acknowledgment
Reduced network bandwidth - increased overhead - and reduced host functions. The other answers are part of solutions to excessive broadcasts
Window size
RIP (Routing Information Protocol)
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

19. What is the purpose of sequence numbers?
32 - there are four octets of 8 bits each in an IPv4 address
Allows the transport layer function on the destination host to reassemble segments in the right order
Does not
1

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.
1
An alternate HTTP port
Data link - physical
Allows the transport layer function on the destination host to reassemble segments in the right order

21. On a particular network how would you determine the default gateway address for a host?
Dynamic / private
The default gateway address is the address of a router interface that is connected to the same network as the host.
False. It's like a file - only one process can read/write.
SMTP

22. Port 443 is?
HTTPS (Secure HTTP)
The default gateway address is the address of a router interface that is connected to the same network as the host.
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
FTP

23. Port 520 is?
Static routing
RIP (Routing Information Protocol)
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
TCP

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

25. What is a common device used to divide/break up a broadcast domain into smaller broadcast domains?
Source and destination (ports) - Sequencing - Acknowledgement - Flow control
TCP
Routers (the subnetting process)
FTP

26. Which of the following are true about static and dynamic routing?
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
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
Connectionless - Best effort (unreliable) - media independent

27. Port 110 is?
POP3
Synchronize sequence numbers
To track the different conversations crossing the network at the same time
TCP. It makes larger demands on a network

28. 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?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
DNS - video-streaming - VoIP
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
RIP (Routing Information Protocol)

29. Which of the following is true about IP?

30. Why does TCP use a sequence number in the header?
Acknowledgment field significant
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 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
Ephermeral

31. What are three key factors to consider when grouping hosts into a common network?
1024. The lower numbers are the well-known ports.1024 through 49151 are registered ports and used by the host for dynamic port allocation
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
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.

32. 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
Upper
An alternate HTTP port
Ephermeral

33. ACK is?
Does not
Ephermeral
Acknowledgment field significant
SMTP

34. The three-way handshake performs what three functions?
Ephermeral
IP. TCP is connection-oriented - and UDP is connectionless but works on the transport 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.
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

35. What is the protocol number for UDP?
User Datagram Protocol
Dynamic routing adds packet-processing overhead - and routers can use static and dynamic routing simultaneously
FTP
17 (A flag is set in the segment header. If this flag actually reads 17 - it is identified as a UDP header)

36. In networking terms - What is reliability?
Maximum transmission unit
Dynamic / private
The source and destination port number
It means ensuring that each segment that the source sends arrives at the destination

37. Which characteristics are part of TCP? Pick two: Reliable - connectionless - no flow control - resends anything not received?
1
TCP
Yes - for applications and services such as http - pop - smtp. Client requests services from a specific port.
Reliable - connection-oriented protocol (resends if not received)

38. What is the purpose of the ToS field in the IPv4 header?
It means ensuring that each segment that the source sends arrives at the destination
Next hop - metric and destination network. Routers do not need source address - last hop - or default gateway to find a path to the network.
TCP uses flow control
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.

39. How many bits are in an IPv6 address?
128
SYN -> SYN.ACK->SEQ - ACK = SEQ+1 - SEQ is a random #
Not - these are done by other protocols in other layers
Synchronize sequence numbers

40. SYN is?
Synchronize sequence numbers
SMTP
FTP
Telnet

41. The three main features of routes in a routing table are?
Destination network - next-hop - metric
53
DNS - video-streaming - VoIP
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. Port 23 is?
Telnet
Synchronize sequence numbers
49152 - 65535.
Maximum transmission unit

43. MSN messenger uses TCP or UDP?
Gateway
Upper
TCP
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

44. The router a network uses to send and receive messages beyond the network is called a ___________ router.
It Doesn't - TCP does
Gateway
FTP
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

45. What is the port range for dynamic or private ports
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
49152 - 65535.
TCP
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

46. How does UDP keep track of sequence numbers?

47. What is the proper order of FIN sequence?
Window size
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)
Destination network - next-hop - metric
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

48. UDP does or does not create a session?
TCP
Acknowledgment field significant
Does not
Source and destination (ports) - Sequencing - Acknowledgement - Flow control

49. What is the port range for Registered ports
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 - 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
Netstat -r and route print
FIN -> FIN.ACK (terminate client to server) - FIN->FIN.ACK->Ack recvd (terminate server to client)

50. Port 20 is?
Dynamic / private
FTP
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
53