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Computer Networking > Lab 1 > Flashcards

Lab 1 Flashcards

1
Q

Why are some FastEthernet ports on the switches up and others are down?

A

When there are wires connected to the FastEthernet ports it sets the status of the port to up to show that it is in use. When the port is not connected it will be down.

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2
Q

What could prevent a ping from being sent between the PCs?

A

The firewall can prevent pings if it is enabled.

If the ip address is wrong

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3
Q

How do we prevent unauthorized individuals from viewing passwords in the configuration file?

A

To prevent this you should create a secret password. The command for this is: enable secret then write the password and hit enter.

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4
Q

What type of interface has no physical port associated with it? Which interface and in which devices this type of interface is used in this lab?

A

The loopback interface has no physical ports.

The loopback interface is found in routers.

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5
Q

Why does Wireshark show the actual MAC address of the local hosts, but not the actual MAC address for the remote hosts?

A

Wireshark will not show the physical address of the remote hosts because they are on different networks.

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6
Q

Frames exchanged between devices in different IP networks must be first forwarded to which network device the same LAN?

A

Router

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7
Q

What is used to determine the network portion of an IPv4 address?

A

Subnet Mask

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8
Q

What is the order of the two addresses in the data link frame?

A

Source data link address

Destination data link address

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9
Q

Why are two strands of fiber used for a single fiber optic connection?

A

Has the ability for full-duplex connectivity.

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10
Q

What is the definition of bandwidth?

A

The amount of data that can flow from one place to another in a given amount of time

Basically the rate of speed that data is sent between a given path.

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11
Q

What is indicated by the term throughput?

A

Throughput is the measure of the transfer of bits across the media over a given period of time.

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12
Q

Which standards organization oversees development of wireless LAN standards?

A

IEEE

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13
Q

What is the length in binary bits for IPv4 addresses and which numbering system is used to represent these addresses? In which layer of the OSI model is this type of address used?

A

IP Address Length is 32 bits
Represented by decimal
In the Internet Layer

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14
Q

What is the length in binary bits for IPv6 addresses and which numbering system is used to represent these addresses? In which layer of the OSI model is this type of address used?

A

IP Address Length is 128 bits
Represented by hexadecimal
In the Internet Layer

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15
Q

What is the length in binary bits for MAC addresses and which numbering system is used to represent these addresses? In which layer of the OSI model is this type of address used?

A

IP Address Length is 48 bits
Represented by hexadecimal
In the data-link layer

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16
Q

What is the difference between half-duplex and full-duplex communication methods and provide one example for each method?

A

half-duplex sends then receives (or the reverse), whereas full-duplex does both at once.
Examples:
Half Duplex - WLAN or Walkie talkies
Full Duplex - Telephones

17
Q

Provide five services performed by the data link layer of the OSI model?

A

Framing, Addressing, Synchronization, Error Control, Flow Control

18
Q

What are the two methods used for switching data between ports on a switch?

A

Store and forward switching.

Cut-through switching.

19
Q

What feature automatically negotiates the best speed and duplex setting between interconnecting devices?

A

Autonegotiation

20
Q

Explain why we may need to configure a layer 2 switch with a default gateway address, in addition, to configuring one of its SVI with an IP address and a subnet mask.

A

Allows remote management of the switch.

21
Q

List three improvements provided by IPv6 as compared to IPv4.

A

Increases address size from being 32 bits to 128 bits.
Increased security
Better/Efficient Routing

22
Q

List the three private address blocks of IPv4 and then identify the main difference between private and public IPv4 addresses.

A
  1. 0.0.0 - 10.255.255.255
  2. 16.0.0 - 172.31.255.255
  3. 168.0.0 - 192.168.255.255

Public ipv4 addresses are globally routed between ISP routers.
Whereas private addresses are ipv4s that can not be used on the internet.

23
Q

List and briefly explain the two ways of how a router can learn about remote networks.

A

Static routing - Remote networks are manually entered into the route table using static routes

Dynamic Routing - Automatically learns about router information and adds the best route to its routing table.

24
Q

Which field in an IPv4 packet is used by the router to determine if a packet has expired and should be dropped?

A

Time to Live field (TTL) indicates the maximum time the datagram is allowed to remain in the internet system.

25
Q

What is the special use of the IPv4 Link-Local addresses and what is the range of these addresses?

A

Link-local addresses (169.254.0.0 /16 or 169.254.0.1 to 169.254.255.254)

They are used by a Windows DHCP client to self-configure in the event that there are no DHCP servers available.

26
Q

What are the three parts of an IPv6 global unicast address?

A

An interface ID that is used to identify the local host on the network
A global routing prefix that is used to identify the network portion of the address that has been provided by an ISP
A subnet ID that is used to identify networks inside of the local enterprise site

27
Q

What are the two types of IPv6 multicast addresses?

A

well-known multicast addresses and solicited node multicast addresses.
The first is reserved for predefined groups of devices whereas the second is assigned.

28
Q

Given a /48 Global Routing Prefix and a /64 prefix, what is the subnet portion of the following address:
2001:db8:cafe:5555:4444:3333:2222:1111?

A

5555

29
Q

List three methods for dynamic addressing for IPv6 GUAs.

A

Method 1: SLAAC - “I have everything you need including the prefix, prefix length, and default gateway address.”

Method 2: SLAAC with a stateless DHCPv6 server - “Here is my information but you need to get other information such as DNS addresses from a stateless DHCPv6 server.”

Method 3: Stateful DHCPv6 (no SLAAC) - “I can give you your default gateway address. You need to ask a stateful DHCPv6 server for all your other information.”

30
Q

List the two types of ICMP messages that are used for a successful Ping.

A

The two types are:
Echo request
Echo reply

Computer Networking (1 decks)

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