Network Infrastructure Ch7
Which of the following is a MAC multicast address?
01:00:5e:76:CB:43
Assume you have the following devices in your home; one wireless router, two smart TVs, one desktop computer, two laptops, two cell phones, one smart doorbell, one smart garage and one Alexa (or one Siri if you have money to burn). You would like all your devices to be able to connect to the Internet. What is the total number of IP addresses and the number of routable IP addresses you will need to accomplish this? Your answer will be two numbers. Enter the larger number first and enter your answer as two numbers with a single space between them. For example, if your answer is 6 and 4 enter 6 4, not 4 6 or 6, 4.
12 1 (11 total devices, but the wireless router has two different IP addresses, one for internal connected to the devices and one for external connected to the internet)
Which of the following is NOT a private address range?
168.192.0.0/12
What does a switch do when it receives an ethernet frame with a destination MAC address that is not found in the table it uses to route incoming ethernet frames to the correct destination port?
A copy of the frame sent to every port on the switch except the port connected to the device that originally transmitted the frame
Which of the following is likely to use a MAC multicast address?
A video teleconference
What is the main advantage of using an unmanaged switch compared to a hub?
Ability to filter and forward traffic based on MAC addresses.
Which of the following is a routing protocol?
All the above
Which of the following is a routing protocol used to connect an Autonomous System to another Autonomous System?
BGP (Border Gateway Protocol)
What is the name of the table used by a switch to route incoming ethernet frames to the correct destination port?
CAM or MAC table
What is the key difference between an unmanaged switch and a managed switch?
Configuration and management capabilities
Which of the following can be done with both an unmanaged switch and a managed switch?
Connecting devices in a small area to create a network segment
What is the primary benefit of using VLANs on a single switch?
Enhanced network security
True or False. A switch operates by inspecting the IP addresses in each packet it processes.
False
True or False. Most home routers do NOT use NAT because it requires the use of IPv6
False
True or False. Network repeaters were commonly used in networks that used ethernet cable, but since ethernet cable has been replaced with twisted pair repeaters are no longer used in networking.
False
What types of network media can are typically connected with repeaters?
Fiber optic, coaxial cable, wireless
Which of the following devices operates at the physical layer of the OSI model by simply repeating incoming signals to all connected devices?
Hub
How does a switch build the table it uses to route incoming ethernet frames to the correct destination port?
It examines the source MAC address of any incoming ethernet frames.
What is the purpose of a default route in a routing table?
It identifies the router to use for packets that do not match any specific routes in a routing table
What is the effect of NAT on network security?
It increases security by hiding the internal IP addresses of devices within the network.
What happens to the source port number during the NAT process as the packet passes through the router from the Intranet to the Internet?
It is modified to a random port number.
Which of the following best describes how a router functions?
It operates at the network layer (Layer 3) of the OSI model.
Which of the following are benefits of using Network Address Translation (NAT)? Note - there are multiple correct answers.
It provides an additional layer of security by hiding private network addresses from the outside world., It frees up a large portion of the IPv4 address space.
Which of the following allows the creation of VLANs that can communicate without the need of an external router?
Managed layer 3 switch
Which of the following can be used to create VLANs?
Managed switch
Which of the following connects network devices as well as offering control and flexibility in terms of network configuration?
Managed switch
Which of the following devices provides the ability to configure advanced network features such as VLANs, QoS, and link aggregation?
Managed switch
Which of the following devices operates at the physical layer of the OSI model, connects two pieces of physical media, and amplifies or regenerates the network signal as the signal is passed through the device?
Repeater
Which of the following devices operate at the physical layer of the OSI model?
Repeater, hub
Which device is responsible for determining the best path for data packets to reach their destination across different networks?
Router
Which device reduces the potential for network collisions by breaking network segments into separate broadcast domains?
Router
Which of the following is a communication device that connects other network devices, and receives and forwards data to a specified destination within a single network segment?
Switch
Assume your home network has the devices shown in the figure, which also shows the IP address assigned to each device and the IP address assigned to the network interface on the wireless router that is connected to the Internet. Are there any problems with the IP address assignment, and if so, what should be done to correct the problem(s)?
The IP addresses on the devices connected to your home network are using a routable Class A network address. They should be using a non-routable network address.
What is the primary purpose of a routing protocol in a computer network?
To determine the best route for sending data packets between different networks.
What is the purpose of a routing protocol's metric?
To determine the cost or distance of reaching a network.
What is the primary purpose of a router in a computer network?
To forward data packets between different networks.
What is the main purpose of the Spanning Tree Protocol (STP) in a switched network?
To provide redundancy and prevent network loops.
What is the purpose of the translation table in NAT?
To track private IP addresses and ports, and map them to their corresponding public port.
True or False. All devices connected to a hub share the same collision domain.
True
Assume that you work for a smaller company that uses a single layer 2 switch and a single router to connect the company network to the Internet. Some of the company's devices are in a sales showroom with the remaining devices in offices that are behind a locked door. You want to ensure that the devices in the showroom cannot access devices the offices, but you want all the devices to be able to access the Internet. Can this be accomplished with the equipment you currently have in place, and if so, how?
Yes, by creating VLANs on the switch.
