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Questions and Answers
What is the reason for changing the default username and password on a router or access point?
Where can one find a list of default credentials for various networking devices?
What type of updates may be included in a firmware update provided by the manufacturer?
What is the default username and password for a WRT54G router from Linksys?
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Why do small offices or home offices need to change default credentials for network devices?
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What is the primary reason for updating the firmware on a router or access point?
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What type of security measure involves creating a list that blocks all traffic except for specified destinations?
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In a SoHo environment, what type of device typically combines the functions of a router, switch, firewall, and content filter?
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What protocol is commonly used to automatically assign IP addresses on a network?
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Which type of IP address assignment method might be more reasonable for a small SoHo environment than a large corporate network?
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What is the term used when security relies on keeping the method of protection hidden or obscure?
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What type of filtering allows you to focus on allowing or disallowing access to specific locations?
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What security feature is designed to prevent access to potentially dangerous websites by blocking known bad sites?
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Which approach allows everything through the router except for access to specific IP addresses or sites?
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In a corporate environment, what is a common reason for implementing content filtering on the network?
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'Security through obscurity' may lead to a false sense of security because:
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What is the purpose of configuring IP address reservations in DHCP?
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What does WAN stand for in networking terminology?
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What is the difference between a dynamic and a static WAN IP address?
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What does UPnP stand for in the context of networking?
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Why is it important to manage WAN IP addresses in large organizations differently from home networks?
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What is the primary benefit of using DHCP reservations for assigning IP addresses?
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Which term refers to configuring a router to always associate a specific static IP address with an internet connection?
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What is the purpose of having a dynamic WAN IP address for a home router?
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What is the function of UPnP when used in combination with routers?
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In networking, what does an IP reservation ensure?
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What is the purpose of configuring a guest wireless network on access points?
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What is the importance of turning on encryption for a wireless network?
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In a corporate environment, what does Network Access Control (NAC) utilize for authentication?
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What is the purpose of port forwarding on a Soho router?
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Which type of devices may benefit from port forwarding on a Soho router according to the text?
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What security measure can prevent unauthorized access when connecting a device to an open port in a conference room?
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What would happen if an open port exists in a conference room and someone plugs into it in a corporate environment with NAC enabled?
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What method does port forwarding on a Soho router use to redirect traffic to internal devices?
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What is one reason for administratively disabling unused ethernet connections on a switch in an office environment?
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Why might someone configure a guest wireless network for Internet of Things devices rather than for guests, according to the text?
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What is another term for a screened subnet?
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What is the purpose of disabling SSID broadcast on a wireless network?
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Why is it not recommended to use the default SSID names provided by manufacturers?
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What type of encryption method is commonly used in home settings for wireless networks?
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What is the purpose of a pre-shared key (PSK) in wireless network security?
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What authentication method is commonly used in office environments for wireless networks?
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What would be the consequence of leaving an organization without changing the pre-shared key on wireless access points?
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Study Notes
- Installing routers or access points in small offices or home offices (SoHos) requires changing default usernames and passwords for security reasons.
- Default credentials for SoHo routers and switches are publicly available online, making it easy for attackers to gain access.
- SoHo devices usually come with their own operating system, which is maintained by the manufacturer and updated via firmware.
- Regularly updating firmware ensures that devices have the latest security patches and features.
- Content filtering is a feature available in SoHo routers, which can be used to block traffic to specific IP addresses or websites.
- Two types of content filtering: allow list (block all traffic except for specific IP addresses or websites) and denial list (allow all traffic except for specific IP addresses or websites).
- SoHo devices often combine multiple functions (router, switch, firewall, content filter, etc.) into one piece of hardware.
- Some networks may prefer static IP address assignment instead of DHCP, but it does not provide additional security.
- Dynamic Host Configuration Protocol (DHCP) makes it easy to manage IP addresses by assigning them automatically when devices connect to the network.
- DHCP can also be used to create IP address reservations, which associate specific MAC addresses with assigned IP addresses.
- External IP addresses, also known as WAN IP addresses, are used for internet connectivity and may be dynamically assigned by internet service providers.
- Companies or organizations may prefer having a static external IP address to ensure consistent connectivity.
- Universal Plug and Play (UPnP) is a feature that allows routers to automatically configure themselves for applications that use it, but it can pose a security risk and should be disabled if not necessary.
- A screen subnet or demilitarized zone (DMZ) is a section of the network that is on the firewall but separated from the internal network, perfect for hosting services that need to be accessible from the internet while still being limited from the rest of the network.
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Description
Explore how configuring IP addresses on a DHCP server can simplify network management by automatically assigning IP addresses to connected devices. Learn about the benefits of ensuring consistent IP addresses for devices connecting to the network.