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NEW QUESTION: 1
Scenario
Refer to the topology. Your company has decided to connect the main office with three other remote branch offices using point-to-point serial links.
You are required to troubleshoot and resolve OSPF neighbor adjacency issues between the main office and the routers located in the remote branch offices.
Use appropriate show commands to troubleshoot the issues and answer all four questions.
Instructions
Enter Cisco IOS commands on the device to verify network operation and answer the multiple-choice questions.
THIS TASK DOES NOT REQUIRE DEVICE CONFIGURATION.
Click on the device to gain access to the console of the device. No console or enable passwords are required.
To access the multiple-choice questions, click on the numbered boxes on the left of the top panel.
There are four multiple-choice questions with this task. Be sure to answer all four questions before clicking the Next button.







An OSPF neighbor adjacency is not formed between R3 in the main office and R5 in the Branch2 office.
What is causing the problem?
A. There is an OSPF hello and dead interval mismatch.
B. There is a missing network command in the OSPF process on R5.
C. There is a PPP authentication issue; a password mismatch.
D. There is an area ID mismatch.
Answer: A
Explanation:
Explanation/Reference:
Explanation:
The "show ip ospf interface command on R3 and R5 shows that the hello and dead intervals do not match.
They are 50 and 200 on R3 and 10 and 40 on R5.

NEW QUESTION: 2
Which option is unnecessary for determining the appropriate containment strategy according to NIST.SP800-61 r2?
A. time and resource needed to implement the strategy
B. need for evidence preservation
C. attack vector used to compromise the system
D. effectiveness of the strategy
Answer: C

NEW QUESTION: 3
In an online transaction processing system (OLTP), which of the following actions should be taken when erroneous or invalid transactions are detected?
A. The transactions should be dropped from processing.
B. The transactions should be processed after the program makes adjustments.
C. The transactions should be written to a report and reviewed.
D. The transactions should be corrected and reprocessed.
Answer: C
Explanation:
In an online transaction processing system (OLTP) all transactions are recorded as they occur. When erroneous or invalid transactions are detected the transaction can be recovered by reviewing the logs.
As explained in the ISC2 OIG:
OLTP is designed to record all of the business transactions of an organization as they occur. It is a data processing system facilitating and managing transaction-oriented applications. These are characterized as a system used by many concurrent users who are actively adding and modifying data to effectively change real-time data.
OLTP environments are frequently found in the finance, telecommunications, insurance, retail, transportation, and travel industries. For example, airline ticket agents enter data in the database in real-time by creating and modifying travel reservations, and these are increasingly joined by users directly making their own reservations and purchasing tickets through airline company Web sites as well as discount travel Web site portals. Therefore, millions of people may be accessing the same flight database every day, and dozens of people may be looking at a specific flight at the same time.
The security concerns for OLTP systems are concurrency and atomicity.
Concurrency controls ensure that two users cannot simultaneously change the same data, or that one user cannot make changes before another user is finished with it. In an airline ticket system, it is critical for an agent processing a reservation to complete the transaction, especially if it is the last seat available on the plane.
Atomicity ensures that all of the steps involved in the transaction complete successfully. If one step should fail, then the other steps should not be able to complete. Again, in an airline ticketing system, if the agent does not enter a name into the name data field correctly, the transaction should not be able to complete.
OLTP systems should act as a monitoring system and detect when individual processes abort, automatically restart an aborted process, back out of a transaction if necessary, allow distribution of multiple copies of application servers across machines, and perform dynamic load balancing.
A security feature uses transaction logs to record information on a transaction before it is processed, and then mark it as processed after it is done. If the system fails during the transaction, the transaction can be recovered by reviewing the transaction logs.
Checkpoint restart is the process of using the transaction logs to restart the machine by running through the log to the last checkpoint or good transaction. All transactions following the last checkpoint are applied before allowing users to access the data again.
Wikipedia has nice coverage on what is OLTP:
Online transaction processing, or OLTP, refers to a class of systems that facilitate and manage transaction-oriented applications, typically for data entry and retrieval transaction processing. The term is somewhat ambiguous; some understand a "transaction" in the context of computer or database transactions, while others (such as the Transaction
Processing Performance Council) define it in terms of business or commercial transactions.
OLTP has also been used to refer to processing in which the system responds immediately to user requests. An automatic teller machine (ATM) for a bank is an example of a commercial transaction processing application.
The technology is used in a number of industries, including banking, airlines, mailorder, supermarkets, and manufacturing. Applications include electronic banking, order processing, employee time clock systems, e-commerce, and eTrading.
There are two security concerns for OLTP system: Concurrency and Atomicity
ATOMICITY
In database systems, atomicity (or atomicness) is one of the ACID transaction properties.
In an atomic transaction, a series of database operations either all occur, or nothing occurs.
A guarantee of atomicity prevents updates to the database occurring only partially, which can cause greater problems than rejecting the whole series outright.
The etymology of the phrase originates in the Classical Greek concept of a fundamental and indivisible component; see atom.
An example of atomicity is ordering an airline ticket where two actions are required:
payment, and a seat reservation. The potential passenger must either:
both pay for and reserve a seat; OR
neither pay for nor reserve a seat.
The booking system does not consider it acceptable for a customer to pay for a ticket without securing the seat, nor to reserve the seat without payment succeeding.
CONCURRENCY
Database concurrency controls ensure that transactions occur in an ordered fashion.
The main job of these controls is to protect transactions issued by different users/applications from the effects of each other. They must preserve the four characteristics of database transactions ACID test: Atomicity, Consistency, Isolation, and
Durability. Read http://en.wikipedia.org/wiki/ACID for more details on the ACID test.
Thus concurrency control is an essential element for correctness in any system where two database transactions or more, executed with time overlap, can access the same data, e.g., virtually in any general-purpose database system. A well established concurrency control theory exists for database systems: serializability theory, which allows to effectively design and analyze concurrency control methods and mechanisms.
Concurrency is not an issue in itself, it is the lack of proper concurrency controls that makes it a serious issue.
The following answers are incorrect:
The transactions should be dropped from processing. Is incorrect because the transactions are processed and when erroneous or invalid transactions are detected the transaction can be recovered by reviewing the logs.
The transactions should be processed after the program makes adjustments. Is incorrect because the transactions are processed and when erroneous or invalid transactions are detected the transaction can be recovered by reviewing the logs.
The transactions should be corrected and reprocessed. Is incorrect because the transactions are processed and when erroneous or invalid transactions are detected the transaction can be recovered by reviewing the logs.
References:
Hernandez CISSP, Steven (2012-12-21). Official (ISC)2 Guide to the CISSP CBK, Third
Edition ((ISC)2 Press) (Kindle Locations 12749-12768). Auerbach Publications. Kindle
Edition.
and
http://en.wikipedia.org/wiki/Online_transaction_processing
and
http://databases.about.com/od/administration/g/concurrency.htm

NEW QUESTION: 4
A Windows Communication Foundation (WCF) solution uses the following contract to share a message
across its clients.
(Line numbers are included for reference only.)
01 [ServiceContract]
02 public interface ITeamMessageService
03 {
04 [OperationContract]
05 string GetMessage();
07 [OperationContract]
08 void PutMessage(string message);
09 }
The code for the service class is as follows:
10 public class TeamMessageService: ITeamMessageService
11 {
12 Guid key = Guid.NewGuid();
13 string message = "Today's Message";
14 public string GetMessage()
15 {
16 return stringFormat("Message:{0} Key:{1}",
17 message, key);
18 }
19 public void PutMessage(string message)
20 {
21 this.message = message;
22 }
23 }
The service is self-hosted. The hosting code is as follows:
24 ServiceHost host = new ServiceHost(typeof(TeamMessageService));
25 BasicHttpBinding binding = new BasicHttpBinding(BasicHttpSecurityMode.None):
26 host.AddServiceEndpoint(MyApplication.ITeamMessageService, binding, "http://
localhost:12345");
27 host.Open();
You need to ensure that all clients calling GetMessage will retrieve the same string, even if the message is updated by clients calling PutMessage. What should you do
A. Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
B. Add the following attribute to the TeamMessageService class, before line 10.
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
Then change the binding definition on the service at line 25, and on the client to the following
WSHttpBinding binding = new WSHttpBinding(SecurityMode.None);
binding.ReliableSession.Enabled = true;
C. Redefine the message string in line 13, as follows
static string message = "Today's Message";
Then change the implementation of PutMessage in lines 19-22 to the following
public void PutMessage(string message)
{
TeamMessageServiceMessage.PutMessage;
}
D. Pass a service instance to the instancing code in line 24, as follows.
ServiceHost host = new ServiceHost(new TeamMessageService());
Answer: A
Explanation:
Explanation/Reference: InstanceContextMode Enumeration
(http://msdn.microsoft.com/en-us/library/system.servicemodel.instancecontextmode.aspx)
PerSession A new InstanceContext object is created for each session.
PerCall A new InstanceContext object is created prior to and recycled subsequent to each call. If the
channel does not create a session this value behaves as if it were PerCall.
Single Only one InstanceContext object is used for all incoming calls and is not recycled subsequent
to the calls. If a service object does not exist, one is created.