Name: Job Interview Presentation
Uploaded: 2023-11-07
Duration: 5 min 44 s
Description: [image] Closeup of a logo as a background image. Job Interview Presentation.

[image] Closeup of a logo as a background image. Job Interview Presentation. 

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[image] Closeup of a logo as a background image

The interview will focus on networking fundamentals and consist of 10 questions.. 

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The interview will focus on networking fundamentals and consist of 10 questions.

[image] A close up of a logo image. United States Cyber Command uses state-of-the art technology. However, the fundamentals are as important as any innovative technology. Given that, what are the three basic local area network (LAN) topologies called?. 

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United States Cyber Command uses state-of-the art technology.  However, the fundamentals are as important as any innovative technology. Given that, what are the three basic local area network (LAN) topologies called?

Bus topology - All devices are connected to a single cable or backbone. Signals travel in both directions along the cable and can be received by all devices.

 Ring topology - Devices are connected in a closed loop. Signals travel in one direction around the ring. Each device acts as a repeater, passing the signal along to the next device. Star topology - Devices are connected to a central hub or switch. The hub acts as the central node, and all signals pass through it.

The national mission teams operate on all types of networks. To defend a network, you must first understand the network design on which you are operating. Provide a brief description of each of the following network topologies:. 

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The national mission teams operate on all types of networks.  To defend a network, you must first understand the network design on which you are operating.  Provide a brief description of each of the following network topologies:

Topology​ Description​ bus​ ​All devices are connected to a common central cable called a bus or backbone. Signals travel in both directions along the bus and can be received by all connected devices. Simple but lacks fault tolerance. star​ ​All devices are connected to a central hub or switch. The hub acts as the central node and all signals pass through it. Offers good performance and fault tolerance. ring​ ​Devices connect in a closed loop or ring. Signals travel in one direction around the ring with each device acting as a repeater. Provides fault tolerance but can be limited in performance. mesh​ ​Devices are connected directly to each other with many redundant interconnections. Offers very high redundancy and fault tolerance. hybrid​ ​Uses a combination of multiple topologies like bus, star, or ring. Allows designers to optimize the network for a particular environment or application.

Our employees must have a theoretical and applicable understanding of how networking works. Name each layer of the OSI model. Provide the layer number and name from top to bottom.. 

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Our employees must have a theoretical and applicable understanding of how networking works. Name each layer of the OSI model. Provide the layer number and name from top to bottom.

Layer​ OSI Layer Name​ ​layer 7 ​Application Layer Layer 6​ ​Presentation Layer ​layer 5 ​Session Layer ​layer 4 ​Transport Layer ​layer 3 ​Network Layer ​layer 2 ​Data Link Layer ​layer 1 ​Physical Layer

Briefly describe each function of the OSI model layer. Provide the layer name and the function in your response.. 

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Briefly describe each function of the OSI model layer. 
Provide the layer name and the function in your response.

Layer​ Function​ ​ Application Layer ​Provides network services to applications. High level APIs, including resource sharing, remote file access. Presentation Layer​ ​Translates data formats from application to network format and encrypts data. ​ Session Layer ​Manages connections and sessions between devices. Establishes, maintains and synchronizes sessions. ​Transport Layer ​Transports data segments end to end. Provides reliable transmission through sequencing, flow control and error recovery.
 ​Network Layer ​Handles logical network addresses and finding routes for packets. Routes and forwards packets. ​Data Link Layer ​ Frames data packets and handles physical addressing and access to media. Validates frames, detects errors, manages access. Physical Layer​ ​Transmits raw bit streams over physical medium. Defines electrical, mechanical and functional interfaces.

[image] A close up of a logo as a background image. 

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[image] A close up of a logo as a background image

United States Cyber Command requires an internet service provider (ISP) to connect to the internet.  What is the point at which the operational control of ownership changes from the ISP to United States Cyber Command?

The point at which operational control and ownership changes from the ISP to United States Cyber Command is likely at the demarcation point or demarc.
 The demarcation point is the physical interface between the facilities provided by the ISP and the internal network infrastructure owned and managed by the customer, in this case United States Cyber Command.
 At the demarc, the ISP will terminate their external transmission lines or circuits and provide some form of interface such as a router, switch, or patch panel. This represents the edge of the ISP's network.
 Beyond the demarcation point, United States Cyber Command would be responsible for installing, configuring, securing, monitoring, and managing the internal network hardware and infrastructure that connects to the ISP's demarc.

Our teams operate and encounter all types of devices. Provide a brief description of each of the following common network devices:. 

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Our teams operate and encounter all types of devices.  Provide a brief description of each of the following common network devices:

Networking Device​ Description​ hub​ ​A physical layer device that connects multiple devices together on a network, typically using twisted pair cabling. Hubs do not manage traffic or filter packets, they simply broadcast all received signals to all connected ports. router​ ​A network layer device that connects multiple networks together and routes traffic between them. Routers use routing protocols to determine optimal paths along which to forward packets to their destination network. Routers filter and forward packets based on network layer addresses. NIC​ ​Network interface controller. A NIC is the hardware component that allows a device to connect to a wired or wireless network. It provides a physical interface and the electronics needed to communicate over various media like Ethernet, WiFi, or fiber optic cabling. switch​ ​A data link layer multi-port networking device that connects network segments. Switches manage traffic flows by learning device addresses, inspecting packets, and forwarding them out the appropriate port. They filter and forward frames based on MAC addresses which enhances network performance.

The national mission teams require implementation of common protocols. Provide the port that each of the following protocols use:. 

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The national mission teams require implementation of common protocols. Provide the port that each of the following protocols use:

Protocol​ Port​ HTTP​ ​Port 80 SMTP​ ​Port 25 SNMP​ Port 161 and 162 DNS​ ​Port 53 HTTPS​ ​Port 443 DHCP​ ​Port  67 and 68 TELNET​ ​Port 23

[image] A close up of a logo Description automatically generated. 

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[image] A close up of a logo Description automatically generated

Provide the IP range for each network class:

Class A:0.0.0.0 to 127.255.255.255 Class B:128.0.0.0 to 191.255.255.255 Class C:192.0.0.0 to 223.255.255.255

Note:  The question is asking for the class range, not the private IP range for each class.

Provide the default subnet mask to the class of network:. 

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Provide the default subnet mask to the class of network:

Class​ Format​ Default Subnet Mask​ A​ network.host.host.host​ ​255.0.0.0 B​ network.network.host.host​ ​255.255.0.0 C​ network.network.network.host​ ​255.255.255.0

Describe the purpose of an autonomous system.. An autonomous system (AS) is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators that presents a common, clearly defined routing policy to the internet. The main purposes of an AS are: To aid routing scalability by allowing aggregation of routing prefixes and policies. This reduces the size of global routing tables. To delineate the boundary of network administration. An AS is managed by a single administrative entity such as an ISP, organization or transit provider. To provide autonomy in routing policy. An AS can enforce its own rules regarding how to connect to other networks and propagate routes without reliance on other ASes. To customize routing metrics and peering policies. ASes can define how routing preferences and traffic engineering should occur between themselves and their neighbors.. 

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Describe the purpose of an autonomous system.

An autonomous system (AS) is a collection of connected Internet Protocol (IP) routing prefixes under the control of one or more network operators that presents a common, clearly defined routing policy to the internet. The main purposes of an AS are: To aid routing scalability by allowing aggregation of routing prefixes and policies. This reduces the size of global routing tables. To delineate the boundary of network administration. An AS is managed by a single administrative entity such as an ISP, organization or transit provider. To provide autonomy in routing policy. An AS can enforce its own rules regarding how to connect to other networks and propagate routes without reliance on other ASes. To customize routing metrics and peering policies. ASes can define how routing preferences and traffic engineering should occur between themselves and their neighbors.

[image] A close up of a keyboard Description automatically generated. 

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[image] A close up of a keyboard Description automatically generated

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Job Interview Presentation

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