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NEW QUESTION: 1
A. Option D
B. Option A
C. Option B
D. Option C
Answer: A,B
Explanation:
only A und D possible
It should be pointed out that:
public void blah() {
synchronized (this) {
// do stuff
}}
is semantically equivalent to:
public synchronized void blah() {
// do stuff
}
Incorrect answer:
B: A constructor cannot be synchronized. () Object cannot be resolved to a type
C: in static context (static void main !) no reference to this possible
NEW QUESTION: 2
Customers are receiving emails containing a link to malicious software. These emails are subverting spam filters. The email reads as follows:
Delivered-To: [email protected]
Received: by 10.14.120.205
Mon, 1 Nov 2010 11:15:24 -0700 (PDT)
Received: by 10.231.31.193
Mon, 01 Nov 2010 11:15:23 -0700 (PDT)
Return-Path: <[email protected]>
Received: from 127.0.0.1 for <[email protected]>; Mon, 1 Nov 2010
13:15:14 -0500
(envelope-from <[email protected]>)
Received: by smtpex.example.com (SMTP READY)
with ESMTP (AIO); Mon, 01 Nov 2010 13:15:14 -0500
Received: from 172.18.45.122 by 192.168.2.55; Mon, 1 Nov 2010 13:15:14
-0500
From: Company <[email protected]>
To: "[email protected]" <[email protected]>
Date: Mon, 1 Nov 2010 13:15:11 -0500
Subject: New Insurance Application
Thread-Topic: New Insurance Application
Please download and install software from the site below to maintain
full access to your
account.
www.examplesite.com
________________________________
Additional information: The authorized mail servers IPs are
192.168.2.10 and 192.168.2.11.
The network's subnet is 192.168.2.0/25.
Which of the following are the MOST appropriate courses of action a security administrator could take to eliminate this risk? (Select TWO).
A. Enable STARTTLS on the spam filter.
B. Shut down the SMTP service on the unauthorized mail server.
C. Identify the origination point for malicious activity on the unauthorized mail server.
D. Block port 25 on the firewall for all unauthorized mail servers.
E. Disable open relay functionality.
Answer: B,D
Explanation:
In this question, we have an unauthorized mail server using the IP: 192.168.2.55. Blocking port
25 on the firewall for all unauthorized mail servers is a common and recommended security step.
Port 25 should be open on the firewall to the IP addresses of the authorized email servers only (192.168.2.10 and 192.168.2.11). This will prevent unauthorized email servers sending email or receiving and relaying email.
Email servers use SMTP (Simple Mail Transfer Protocol) to send email to other email servers.
Shutting down the SMTP service on the unauthorized mail server is effectively disabling the mail server functionality of the unauthorized server.
NEW QUESTION: 3
A. Option A
B. Option D
C. Option B
D. Option C
Answer: B