CompTIA Network+ Question C-10

A network administrator received the following email from a user:
From: user@company.com
To: abuse@company.com
Subject: Free smart phone
Dear user,
please click the following link to get your free smart phone http://www.freesmartphone.it:8080/survey.php

Which of of the following should the administrator do to prevent all employees from accessing the link in the above email, while still allowing Internet access to the freesmartphone.it domain?

A. Add http://www.freesmartphone.it:8080/survey.php to the browser group policy block list.
B. Add DENY TCP http://www.freesmartphone.it ANY EQ 8080 to the firewall ACL
C. Add DENY IP ANY ANY EQ 8080 to the intrusion detection system filter
D. Add http://www.freesmartphone.it:8080/survey.php to the load balancer

Correct Answer: A

CompTIA Network+ Question B-7

A company wants to create highly available datacenters. Which of the following will allow the company to continue to maintain an Internet presence at all sites in the event that a WAN circuit at one site goes down?

A. Load balancer
B. VRRP
C. OSPF
D. BGP

Correct Answer: D

Explanation:
A collection of networks that fall within the same administrative domain is called an autonomous system (AS). In this question, each datacenter will be an autonomous system.
The routers within an AS use an interior gateway protocol, such as the Routing Information Protocol (RIP) or the Open Shortest Path First (OSPF) protocol, to exchange routing information among themselves. At the edges of an AS are routers that communicate with the other AS’s on the Internet, using an exterior gateway protocol such as the Border Gateway Protocol (BGP).
If a WAN link goes down, BGP will route data through another WAN link if redundant WAN links are available.

CompTIA Network+ Question A-45

When configuring a new server, a technician requests that an MX record be created in DNS for the new server, but the record was not entered properly. Which of the following was MOST likely installed that required an MX record to function properly?

A. Load balancer
B. FTP server
C. Firewall DMZ
D. Mail server

Correct Answer: D

Explanation:
A mail exchanger record (MX record) is a DNS record used by email servers to determine the name of the email server responsible for accepting email for the recipient’s domain.
For example a user sends an email to recipient@somedomain.com. The sending user’s email server will query the somedomain.com DNS zone for an MX record for the domain. The MX record will specify the hostname of the email server responsible for accepting email for the somedomain.com domain, for example, mailserver.somedomain.com. The sending email server will then perform a second DNS query to resolve mailserver.somedomain.com to an IP address. The sending mail server will then forward the email to the destination mail server.