Network Security and Infrastructure Quiz

Network Threats

• Spyware is software secretly collecting data about user activity, including websites visited.

Network Types

• An extranet is a secure network for suppliers, customers, and collaborators to access corporate resources.
• A WISP (Wireless Internet Service Provider) is recommended in rural areas without wired broadband access.

Network Characteristics

• Scalability enables a network to grow without impacting existing users.
• Fault tolerance allows for service continuity despite hardware failures, like a cut fiber optic cable.

Network Devices

• A router determines the path messages take through internetworks.

Internet Access

• Cellular and satellite internet connections do not require physical cables.
• The internet is a global network of interconnected networks used for online activities like shopping.

BYOD (Bring Your Own Device)

• BYOD allows users to access network resources from personal devices, enhancing flexibility and security.
• VPNs (Virtual Private Networks) provide secure remote access to company networks.

Cisco IOS Configuration

• The running configuration file takes effect immediately when modified.
• User EXEC mode allows viewing some configuration aspects and uses the '>' symbol as its prompt.
• The enable secret command secures privileged EXEC mode access.
• The default SVI (Switch Virtual Interface) on a Cisco switch is VLAN1.
• The hostname must be less than 64 characters, start with a letter, and contain no spaces.
• NVRAM stores the startup configuration file, while RAM holds the running configuration.
• The copy startup-config running-config command copies the startup configuration to RAM.

DHCP (Dynamic Host Configuration Protocol)

• DHCP automatically assigns IP addresses to hosts.

TCP/IP (Transmission Control Protocol/Internet Protocol) Suite

• ICMP (Internet Control Message Protocol) and IP (Internet Protocol) function at the Internet layer (Layer 3 of the OSI model).
• The Transport layer (Layer 4 of the OSI model) segments and reassembles data.

Message Delivery

• Broadcast messages transmit to all devices on a local area network.
• Multicast messages transmit to a specific group of devices.

Data Encoding and Decoding

• Encoding converts information into a format suitable for transmission.
• Decoding converts received data into a readable message.

Network Encapsulation

• An IP packet is encapsulated in a Layer 2 frame before transmission.
• Encapsulation places one message inside another for transfer.
• From a web client's perspective, the protocol stack order for a web request is: HTTP, TCP, IP, Ethernet.

Network Security

• Implementing a firewall and antivirus software provides basic network security.

Cisco IOS Command Basics

• Ctrl-Shift-6 interrupts the ping process.
• The show ip interface brief command displays switch interface status and configured IP addresses.

Cisco IOS Configuration Management

• The reload command resets the device without saving changes.
• lineconin is the console password for user EXEC mode.
• This command (copy startup-config running-config) copies the startup configuration to the running configuration.
• The service password-encryption command hides passwords in plain text.

Cisco IOS Command Syntax

• running-config is a keyword in the show running-config command.

Cisco IOS Devices and Interfaces

• The switch virtual interface allows remote management of a Layer 2 switch.

Cisco IOS CLI (Command Line Interface)

• The Tab key completes partially typed words in commands.

Cisco IOS Memory

• RAM (Random Access Memory) loses its contents during a power cycle.
• The device's running configuration is stored in RAM.

Telnet vs. SSH

• SSH provides secure remote sessions with encryption and user authentication, unlike Telnet.

Password Security

• Console, VTY, and privileged EXEC mode can be protected with passwords.

OSI Model

• A logical address is added at the Network layer (Layer 3) during encapsulation.

Network Addressing

• ServerB will generate a packet with the destination IP address of HostA.
• ServerB will generate a frame with the destination MAC address of RouterB.

TCP/IP Protocol Suite

• FTP (File Transfer Protocol), DNS (Domain Name System), and DHCP (Dynamic Host Configuration Protocol) are application layer protocols in the TCP/IP suite.

Protocol Data Units (PDUs)

• A frame format is used when bits are received from the network by a host's NIC.

Multicast Messages

• These messages are sent to a select group of hosts.

Encapsulation

• Encapsulation is the process of placing one PDU inside another.

Protocols and Data Communications

• Protocols define the rules for message exchange between source and destination.

Network Request/Response

• The protocol stack order for decoding a received transmission is: Ethernet, IP, TCP, HTTP.

TCP/IP Encapsulation

• Segments are sent from the transport layer to the internet layer.

OSI Model and TCP/IP Model

• The Data Link and Physical layers of the OSI model correspond to the Network Access layer of the TCP/IP model.

This quiz covers key concepts related to network threats, types, characteristics, and devices. Topics include spyware, extranet functionality, scalability, and BYOD practices. Test your knowledge on how these elements interact to facilitate secure internet access and connectivity.