A technician just completed a new external website and setup access rules in the firewall. After some testing, only users outside the internal network can reach the site. The website responds to a ping from the internal network and resolves the proper public address. Which of the following could the technician do to fix this issue while causing internal users to route to the website using an internal address?
A. Configure NAT on the firewall B. Implement a split horizon DNS C. Place the server in the DMZ D. Adjust the proper internal ACL
Correct Answer: B
Explanation: Split horizon DNS (also known as Split Brain DNS) is a mechanism for DNS servers to supply different DNS query results depending on the source of the request. This can be done by hardware-based separation but is most commonly done in software. In this question, we want external users to be able to access the website by using a public IP address. To do this, we would have an external facing DNS server hosting a DNS zone for the website domain. For the internal users, we would have an internal facing DNS server hosting a DNS zone for the website domain. The external DNS zone will resolve the website URL to an external public IP address. The internal DNS server will resolve the website URL to an internal private IP address.
You have been tasked with setting up a wireless network in an office. The network will consist of 3 access points and a single switch. The network must meet the following parameters.
The SSIDs need to be configured as corpnet with a key of S3cr3t! The wireless signals should not interfere with each other.
The subnet the Access points and Switch are on should only support 30 devices maximum The access Points should be configured to only support TKIP clients at a maximum speed
Instructions: Click on the devices to review their information and adjust the setting of the APs to meet the given requirements.
Correct Answer:
Exhibit 1 as follows
Access Point Name: AP1
IP Address: 192.168.1.3
Gateway: 192.168.1.2
SSID: corpnet
SSID Broadcast: yes
Mode: G
Channel: 1
Speed: Auto
Duplex: Auto
WPA Passphrase: S3cr3t!
Exhibit 2 as follows
Access Point Name: AP2
IP Address: 192.168.1.4
Gateway: 192.168.1.2
SSID: corpnet
SSID Broadcast: yes
Mode: G
Channel: 6
Speed: Auto
Duplex: Auto
WPA Passphrase: S3cr3t!
Exhibit 3 as follows
Access Point Name: AP3
IP Address: 192.168.1.5
Gateway: 192.168.1.2
SSID: corpnet
SSID Broadcast: yes
Mode: G
Channel: 11
Speed: Auto
Duplex: Auto
WPA Passphrase: S3cr3t!
Corporate headquarters provided your office a portion of their class B subnet to use at a new office location. Allocate the minimum number of addresses (using CIDR notation) needed to accommodate each department.
After accommodating each department, identify the unused portion of the subnet by responding to the question on the graphic. All drop downs must be filled. Instructions: When the simulation is complete, please select the Done button to submit.
All Networks have the range from /0 to/32
Correct Answer:
Explanation:
An IPv4 address consists of 32 bits. The first x number of bits in the address is the network address and the remaining bits are used for the host addresses. The subnet mask defines how many bits form the network address and from that, we can calculate how many bits are used for the host addresses.
The formula to calculate the number of hosts in a subnet is 2n – 2. The “n” in the host’s formula represents the number of bits used for host addressing. If we apply the formula (22 – 2), we can determine that the following subnets should be configured:
Sales network – /26 – This will provide up to 62 usable IP addresses (64-2 for subnet and broadcast IP) HR network – /27 – This will provide for up to 30 usable IP’s (32-2)
IT – /28 – This will provide for up to 14 usable IP’s (16-2)
Finance – /26 – Note that a /27 is 32 IP addresses but 2 of those are reserved for the network and broadcast IP’s and can’t be used for hosts. Marketing – /28
If we add up how many IP blocks are used that is 64+32+16+64+16=192. A /24 contains 256 IP addresses, so 256-192=64.
So the last unused box should be a /26, which equates to 64 addresses
Which of the following should a technician implement to prevent external contractors from physically plugging devices into the company’s network jacks unless such jacks are designated for guest use?
A. Disable DHCP and assign a static IP address to each network device physically connected to the network. B. Enable MAC address filtering across all network jacks and record the MAC address of guest devices. C. Disable all switch ports when they are not utilized and enable them on an as needed basis. D. Place guest network jacks in public areas and all other jacks in secure areas as needed.
A user states that they cannot connect to the network or the Internet. The technician determines the issue is that the computer has a static IP address and needs to use DHCP to work correctly. The technician sets the NIC to automatically assign an IP address. Which of the following should the technician perform NEXT?
A. Identify the type of network card and what Operating System the computer is running B. Confirm the computer is back on the network and has Internet connectivity C. They need to annotate what the static IP address was and inform the employees manager D. They need to determine why the NIC was assigned a static IP address
A small office has two routers, one wired and one wireless. Peter, a laptop user, experiences no issues while at his desk, but when he unplugs his laptop to go to a conference room, Peter is no longer able to access the Internet. Other users do not have this issue. A technician checks the laptop and sees an IP address of 169.254.13.142. Which of the following actions should the technician take FIRST so that Peter can access the Internet?
A. Disable the wired connection. B. Reinstall DHCP on the server. C. Refresh the network connection. D. Power cycle the wireless router.
A technician has been dispatched to a SOHO to troubleshoot an issue with a USB printer shared on the network. All networked devices obtain their IP address automatically from the router. Additionally, all computers were printing fine the previous day, when the printer was first installed. Which of the following should the technician implement to fix the printing issue?
A. A DHCP reservation should be made for the host computer. B. The printer should be connected to a USB hub. C. An updated printer driver should be installed on all office computers. D. The printer should be configured with a static IP address.
