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TN275 Network Fundamentals > Chapter 4 & 5 > Flashcards

Chapter 4 & 5 Flashcards

1
Q

Refer to the exhibit. What two pieces of information can be determined from the output that is shown? (Choose two.)

  • The local host is using three client sessions.
  • The local host is using web sessions to a remote server.
  • The local host is listening for TCP connections using public addresses.
  • The local host is using well-known port numbers to identify the source ports.
  • The local host is performing the three-way handshake with 192.168.1.101:1037.
A

The local host is using three client sessions.

The local host is using web sessions to a remote server.

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2
Q

After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?

  • 13
  • 53
  • 80
  • 1024
  • 1728
A

80

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3
Q

Which information is found in both the TCP and UDP header information?

  • sequencing
  • flow control
  • acknowledgments
  • source and destination
A

source and destination

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4
Q

Which is an important characteristic of UDP?

  • acknowledgement of data delivery
  • minimal delays in data delivery
  • high reliability of data delivery
  • same order data delivery
A

minimal delays in data delivery

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5
Q

Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?

  • create a Layer 1 jam signal
  • reach a timeout and resend the data that needs to be acknowledged
  • send a RESET bit to the host
  • change the window size in the Layer 4 header
A

reach a timeout and resend the data

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6
Q

Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?

  • session establishment
  • segment retransmit
  • data transfer
  • session disconnect
A

session establishment

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7
Q

Refer to the exhibit. The initial TCP exchange of data between two hosts is shown in the exhibit. Assuming an initial sequence number of 0, what sequence number will be included in Acknowledgment 2 if Segment 6 is lost?

  • 2
  • 3
  • 6
  • 1850
  • 3431
  • 3475
A

3431

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8
Q

Why is flow control used for TCP data transfer?

  • to synchronize equipment speed for sent data
  • to synchronize and order sequence numbers so data is sent in complete numerical order
  • to prevent the receiver from being overwhelmed by incoming data
  • to synchronize window size on the server
  • to simplify data transfer to multiple hosts
A

to prevent the receiver from being overwhelmed by incoming data

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9
Q

During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?

  • The packets will not be delivered.
  • The packets will be retransmitted from the source.
  • The packets will be delivered and reassembled at the destination.
  • The packets will be delivered and not reassembled at the destination.
A

The packets will be delivered and reassembled at the destination.

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10
Q

With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?

  • 0 to 255
  • 256 to 1022
  • 0 to 1023
  • 1024 to 2047
  • 49153 to 65535
A

0 to 1023

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11
Q

Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?

  • TCP
  • IP
  • UDP
  • HTTP
  • DNS
A

UDP

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12
Q

What are two features of the User Datagram Protocol (UDP)? (Choose two.)

  • flow control
  • low overhead
  • connectionless
  • connection-oriented
  • sequence and acknowledgements
A

low overhead

connectionless

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13
Q

What mechanism is used by TCP to provide flow control as segments travel from source to destination?

  • sequence numbers
  • session establishment
  • window size
  • acknowledgments
A

window size

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14
Q

What is dynamically selected by the source host when forwarding data?

  • destination logical address
  • source physical address
  • default gateway address
  • source port
A

source port

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15
Q

Why are port numbers included in the TCP header of a segment?

  • to indicate the correct router interface that should be used to forward a segment
  • to identify which switch ports should receive or forward the segment
  • to determine which Layer 3 protocol should be used to encapsulate the data
  • to enable a receiving host to forward the data to the appropriate application
  • to allow the receiving host to assemble the packet in the proper order
A

to enable a receiving host to forward the data to the appropriate application

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16
Q

Which two options represent Layer 4 addressing? (Choose two.)

  • identifies the destination network
  • identifies source and destination hosts
  • identifies the communicating applications
  • identifies multiple conversations between the hosts
  • identifies the devices communicating over the local media
A

identifies the communicating applications

identifies multiple conversations between the hosts

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17
Q

Which three features allow TCP to reliably and accurately track the transmission of data from source to destination?

  • encapsulation
  • flow control
  • connectionless services
  • session establishment
  • numbering and sequencing
  • best effort delivery
A

flow control

session establishment

numbering and sequencing

18
Q

Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?

  • application
  • presentation
  • session
  • transport
  • network
A

transport

19
Q

Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)

  • This is a UDP header.
  • This contains a Telnet request.
  • This contains a TFTP data transfer.
  • The return packet from this remote host will have an Acknowledgement Number of 43693.
  • This is a TCP header.
A

This is a TCP header.

This contains a Telnet request.

20
Q

Which event occurs during the transport layer three-way handshake?

  • The two applications exchange data.
  • TCP initializes the sequence numbers for the sessions.
  • UDP establishes the maximum number of bytes to be sent.
  • The server acknowledges the bytes of data received from the client.
A

TCP initializes the sequence numbers for the sessions.

21
Q

Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has sent a SYN message to begin session establishment. What happens next?

  • Host1 sends a segment with the ACK flag = 0, SYN flag = 0 to Host2.
  • Host1 sends a segment with the ACK flag = 1, SYN flag = 0 to Host2.
  • Host1 sends a segment with the ACK flag = 1, SYN flag = 1 to Host2.
  • Host2 sends a segment with the ACK flag = 0, SYN flag = 1 to Host1.
  • Host2 sends a segment with the ACK flag = 1, SYN flag = 0 to Host1.
  • Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1.
A

Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1.

22
Q

In an IPv4 environment, what information is used by the router to forward data packets from one interface of a router to another?

  • destination network address
  • source network address
  • source MAC address
  • well known port destination address
A

destination network address

23
Q

What information is added during encapsulation at OSI Layer 3?

  • source and destination MAC
  • source and destination application protocol
  • source and destination port number
  • source and destination IP address
A

source and destination IP address

24
Q

In a connectionless system, which of the following is correct?

  • The destination is contacted before a packet is sent.
  • The destination is not contacted before a packet is sent.
  • The destination sends an acknowledgement to the source that indicates the packet was received.
  • The destination sends an acknowledgement to the source that requests the next packet to be sent.
A

The destination is not contacted before a packet is sent.

25
Q

Which IP packet field will prevent endless loops?

  • type-of-service
  • identification
  • flags
  • time-to-live
  • header checksum
A

time-to-live

26
Q

Which portion of the network layer address does a router use to forward packets?

  • host portion
  • broadcast address
  • network portion
  • gateway address
A

network portion

27
Q

Refer to the exhibit. Using the network in the exhibit, what would be the default gateway address for host A in the 192.133.219.0 network?

  • 192.135.250.1
  • 192.31.7.1
  • 192.133.219.0
  • 192.133.219.1
A

192.133.219.1

28
Q

If the default gateway is configured incorrectly on the host, what is the impact on communications?

  • The host is unable to communicate on the local network.
  • The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.
  • The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network.
  • There is no impact on communications.
A

The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.

29
Q

What is the purpose of a default gateway?

  • physically connects a computer to a network
  • provides a permanent address to a computer
  • identifies the network to which a computer is connected
  • identifies the logical address of a networked computer and uniquely identifies it to the rest of the network
  • identifies the device that allows local network computers to communicate with devices on other networks
A

identifies the device that allows local network computers to communicate with devices on other networks

30
Q

What type of routing uses information that is manually entered into the routing table?

  • dynamic
  • interior
  • static
  • standard
A

static

31
Q

When the destination network is not listed in the routing table of a Cisco router, what are two possible actions that the router might take? (Choose two.)

  • The router sends an ARP request to determine the required next hop address.
  • The router discards the packet.
  • The router forwards the packet toward the next hop indicated in the ARP table.
  • The router forwards the packet to the interface indicated by the source address.
  • The router forwards the packet out the interface indicated by the default route entry.
A

The router discards the packet.

The router forwards the packet out the interface indicated by the default route entry.

32
Q

What are the key factors to consider when grouping hosts into a common network? (Choose three.)

  • gateways
  • purpose
  • physical addressing
  • software version
  • geographic location
  • ownership
A

purpose

geographic location

ownership

33
Q

What is a component of a routing table entry?

  • the MAC address of the interface of the router
  • the destination Layer 4 port number
  • the destination host address
  • the next-hop address
A

the next-hop address

34
Q

Which intermediary devices could be used to implement security between networks? (Choose two.)

  • router
  • hub
  • switch
  • firewall
  • access point
  • bridge
A

router

firewall

35
Q

What are three common problems with a large network? (Choose three.)

  • too few broadcasts
  • performance degradation
  • security issues
  • limited management responsibility
  • host identification
  • protocol compatibility
A

performance degradation

security issues

host identification

36
Q

Refer to the exhibit. All devices shown in the exhibit have factory default settings. How many broadcast domains are represented in the topology that is shown?

  • 3
  • 4
  • 5
  • 7
  • 8
  • 11
A

4

37
Q

Which three statements are true about routes and their use? (Choose three.)

  • If no route to the destination network is found, the packet is returned to the previous router.
  • If the destination network is directly connected, the router forwards the packet to the destination host.
  • If multiple network entries exist for the destination network, the most general route is used to forward the packet.
  • If no route exists for the destination network and a default route is present, the packet is forwarded to the next-hop router.
  • If the originating host has a default gateway configured, the packet for a remote network can be forwarded using that route.
  • If a host does not have a route manually configured for the destination network, the host will drop the packet.
A

If the destination network is directly connected, the router forwards the packet to the destination host.

If no route exists for the destination network and a default route is present, the packet is forwarded to the next-hop router.

If the originating host has a default gateway configured, the packet for a remote network can be forwarded using that route.

38
Q

Refer to the exhibit. A network administrator is troubleshooting a connectivity problem and needs to determine the address that is used to forward network packets out the network. Using the netstat -r command, the administrator would identify which address as the address to which all hosts send packets that are destined for an outside network?

  • 10.10.10.26
  • 127.0.0.1
  • 10.10.10.6
  • 10.10.10.1
  • 224.0.0.0
A

10.10.10.6

39
Q

Refer to the exhibit. A network administrator notices that there are too many broadcasts on the network. What two steps can the network administrator take to resolve this problem? (Choose two.)

  • Replace S2 with a router.
  • Place all servers on S1.
  • Disable TCP/IP broadcasts.
  • Subnet the 192.168.0.0 /24 network.
  • Disable all unused interfaces on the switches.
A

Replace S2 with a router.

Subnet the 192.168.0.0 /24 network.

40
Q

Refer to the exhibit. The network in the exhibit is fully operational. What two statements correctly describe the routing for the topology that is shown? (Choose two.)

  • 192.168.0.2 is the next-hop address that is used by R3 to route a packet from the 10.0.0.0 network to the 172.16.0.0 network.
  • 10.0.0.1 is the next-hop address that is used by R1 to route a packet from the 192.168.12.0 network to the 10.0.0.0 network.
  • 192.168.0.1 is the next-hop address that is used by R1 to route a packet from the 192.168.12.0 network to the 172.16.0.0 network.
  • 172.16.0.1 is the next-hop address that is used by R3 to route a packet from the 10.0.0.0 to the 172.16.0.0 network.
  • 192.168.0.1 is the next-hop address that is used by R2 to route a packet from the 172.16.0.0 network to the 192.168.12.0 network.
  • 192.168.0.2 is the next-hop address that is used by R2 to route a packet from the 172.16.0.0 network to the 192.168.12.0 network.
A
  1. 168.0.2 is the next-hop address that is used by R3 to route a packet from the 10.0.0.0 network to the 172.16.0.0 network.
  2. 168.0.1 is the next-hop address that is used by R2 to route a packet from the 172.16.0.0 network to the 192.168.12.0 network.
41
Q

What two characteristics are commonly associated with dynamic routing protocols? (Choose two.)

  • require no device configuration
  • provide routers with up-to-date routing tables
  • require less processing power than static routes require
  • consume bandwidth to exchange route information
  • prevent manual configuration and maintenance of the routing table
A

provide routers with up-to-date routing tables

consume bandwidth to exchange route information

42
Q

What statement describes the purpose of a default route?

  • A host uses a default route to transfer data to another host on the same network segment.
  • A host uses a default route to forward data to the local switch as the next hop to all destinations.
  • A host uses a default route to identify the Layer 2 address of an end device on the local network.
  • A host uses a default route to transfer data to a host outside the local network when no other route to the destination exists.
A

A host uses a default route to transfer data to a host outside the local network when no other route to the destination exists.

TN275 Network Fundamentals (3 decks)

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