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NEW QUESTION: 1
You are part of a security staff at a highly profitable bank and each day, all traffic on the network is logged for later review. Every Friday when major deposits are made you're seeing a series of bits placed in the "Urgent Pointer" field of a TCP packet. This is only 16 bits which isn't much but it concerns you because:
A. It is normal traffic because sometimes the previous fields 16 bit checksum value can over run into the urgent pointer's 16 bit field causing the condition.
B. It could be a sign of a damaged network cable causing the issue.
C. This could be a sign of covert channeling in bank network communications and should be investigated.
D. It could be a symptom of malfunctioning network card or drivers and the source system should be checked for the problem.
Answer: C
Explanation:
The Urgent Pointer is used when some information has to reach the server ASAP.
When the TCP/IP stack at the other end sees a packet using the Urgent Pointer set, it is duty
bound to stop all ongoing activities and immediately send this packet up the stack for immediate
processing. Since the packet is plucked out of the processing queue and acted upon immediately,
it is known as an Out Of Band (OOB) packet and the data is called Out Of Band (OOB) data.
The Urgent Pointer is usually used in Telnet, where an immediate response (e.g. the echoing of
characters) is desirable.
Covert Channels are not directly synonymous with backdoors. A covert channel is simply using a
communication protocol in a way it was not intended to be used or sending data without going
through the proper access control mechanisms or channels. For example, in a Mandatory Access
Control systems a user at secret has found a way to communicate information to a user at
Confidential without going through the normal channels.
In this case the Urgent bit could be use for a few reasons:
1.It could be to attempt a Denial of service where the host receiving a packet with the Urgent bit set will give immediate attention to the request and will be in wait state until the urgent message is receive, if the sender does not send the urgent message then it will simply sit there doing nothing until it times out. Some of the TCP/IP stacks used to have a 600 seconds time out, which means that for 10 minutes nobody could use the port. By sending thousands of packet with the URGENT flag set, it would create a very effective denial of service attack.
2.It could be used as a client server application to transmit data back and forward without going through the proper channels. It would be slow but it is possible to use reserved fields and bits to transmit data outside the normal communication channels.
The other answers are incorrect The following reference(s) were/was used to create this question: http://www.vijaymukhi.com/vmis/tcp.htm and http://www.fas.org/irp/nsa/rainbow/tg030.htm document covering the subject of covert channels and also see: http://gray-world.net/papers.shtml which is a large collection of documents on Covert Channels
NEW QUESTION: 2
Which activity can you perform as a member of the Supplier Request Manager system group?
A. Manage the supplier request template.
B. Approve a supplier request.
C. Create a supplier request.
D. Request a preferred category status change.
Answer: C
NEW QUESTION: 3
Which two statements define the types of DNS resolvers that exist? (Choose two.)
A. An Internet resolver allows instances to use the host names that are published on the Internet.
B. A custom resolver allows instances to use the host names of the hosts in your on-prem network that are connected to your VCN by an IPSec VPN connection.
C. A VCN resolver allows instances to use the host names of the hosts in your on-prem network that are connected to your VCN by an IPSec VPN connection.
D. A VCN resolver allows instances to use host names to communicate with instances on other VCNs in your tenancy.
Answer: A,B
Explanation:
Explanation
https://docs.cloud.oracle.com/iaas/Content/Network/Concepts/dns.htm
This is an Oracle-provided option that includes two parts:Internet Resolver: Lets instances resolve hostnames that are publicly published on the internet. The instances do not need to have internet access by way of either an internet gateway or a connection to your on-premises network (such as an IPSec VPN connection through a DRG ).VCN Resolver: Lets instances resolve hostnames (which you can assign) of other instances in the same VCN. For more information, see About the DNS Domains and Hostnames.By default, new VCNs you create use the Internet and VCN Resolver. If you're using the Networking API, this choice refers to the VcnLocalPlusInternet enum in the DhcpDnsOption object.
The Internet and VCN Resolver does not let instances resolve the hostnames of hosts in your on-premises network connected to your VCN by IPSec VPN connection or FastConnect. Use your own custom DNS resolver to enable that.
https://docs.cloud.oracle.com/iaas/Content/Network/Concepts/dns.htm?Highlight=DNS%20resolver#About