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Learn about the ThreatsTargets of Phishing/DNS/ARIN DNS records, Social engineering attacks; scammers are using social engineering methods to do wrong and gain access into networks, which are vulnerable to these types of attacks. The Cybercriminal will release an email to the user, pretending to be the system administrator, asking them to perform a procedure or change their password. If the user follows through with these changes, it may expose the network and allow cybercriminals access.
ISC System Security Certified Practitioner (SSCP) Sample Questions (Q250-Q255):NEW QUESTION # 250
What is NOT true about a one-way hashing function?
Answer: A
Explanation:
Explanation/Reference:
A one way hashing function can only be use for the integrity of a message and not for authentication or confidentiality. Because the hash creates just a fingerprint of the message which cannot be reversed and it is also very difficult to create a second message with the same hash.
A hash by itself does not provide Authentication. It only provides a weak form or integrity. It would be possible for an attacker to perform a Man-In-The-Middle attack where both the hash and the digest could be changed without the receiver knowing it.
A hash combined with your session key will produce a Message Authentication Code (MAC) which will provide you with both authentication of the source and integrity. It is sometimes referred to as a Keyed Hash.
A hash encrypted with the sender private key produce a Digital Signature which provide authentication, but not the hash by itself.
Hashing functions by themselves such as MD5, SHA1, SHA2, SHA-3 does not provide authentication.
Source: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2001, Page
548
NEW QUESTION # 251
Which device acting as a translator is used to connect two networks or applications from layer 4 up to layer 7 of the ISO/OSI Model?
Answer: D
Explanation:
A gateway is used to connect two networks using dissimilar protocols at the
lower layers or it could also be at the highest level of the protocol stack.
Important Note:
For the purpose of the exam, you have to remember that a gateway is not synonymous to
the term firewall.
The second thing you must remembers is the fact that a gateway act as a translation
device.
It could be used to translate from IPX to TCP/IP for example. It could be used to convert
different types of applications protocols and allow them to communicate together. A
gateway could be at any of the OSI layers but usually tend to be higher up in the stack.
For your exam you should know the information below:
Repeaters
A repeater provides the simplest type of connectivity, because it only repeats electrical
signals between cable segments, which enables it to extend a network. Repeaters work at the physical layer and are add-on devices for extending a network connection over a greater distance. The device amplifies signals because signals attenuate the farther they have to travel. Repeaters can also work as line conditioners by actually cleaning up the signals. This works much better when amplifying digital signals than when amplifying analog signals, because digital signals are discrete units, which makes extraction of background noise from them much easier for the amplifier. If the device is amplifying analog signals, any accompanying noise often is amplified as well, which may further distort the signal. A hub is a multi-port repeater. A hub is often referred to as a concentrator because it is the physical communication device that allows several computers and devices to communicate with each other. A hub does not understand or work with IP or MAC addresses. When one system sends a signal to go to another system connected to it, the signal is broadcast to all the ports, and thus to all the systems connected to the concentrator.
Repeater
Image Reference- http://www.erg.abdn.ac.uk/~gorry/course/images/repeater.gif
Bridges A bridge is a LAN device used to connect LAN segments. It works at the data link layer and therefore works with MAC addresses. A repeater does not work with addresses; it just forwards all signals it receives. When a frame arrives at a bridge, the bridge determines whether or not the MAC address is on the local network segment. If the MAC address is not on the local network segment, the bridge forwards the frame to the necessary network segment.
Bridge C:\Users\MCS\Desktop\1.jpg
Image Reference- http://www.oreillynet.com/network/2001/01/30/graphics/bridge.jpg
Routers Routers are layer 3, or network layer, devices that are used to connect similar or different networks. (For example, they can connect two Ethernet LANs or an Ethernet LAN to a Token Ring LAN.) A router is a device that has two or more interfaces and a routing table so it knows how to get packets to their destinations. It can filter traffic based on access control lists (ACLs), and it fragments packets when necessary. Because routers have more network-level knowledge, they can perform higher-level functions, such as calculating the shortest and most economical path between the sending and receiving hosts.
Router and Switch
Image Reference- http://www.computer-networking-success.com/images/router-switch.jpg
Switches Switches combine the functionality of a repeater and the functionality of a bridge. A switch amplifies the electrical signal, like a repeater, and has the built-in circuitry and intelligence of a bridge. It is a multi-port connection device that provides connections for individual computers or other hubs and switches.
Gateways Gateway is a general term for software running on a device that connects two different environments and that many times acts as a translator for them or somehow restricts their interactions. Usually a gateway is needed when one environment speaks a different language, meaning it uses a certain protocol that the other environment does not understand. The gateway can translate Internetwork Packet Exchange (IPX) protocol packets to IP packets, accept mail from one type of mail server and format it so another type of mail server can accept and understand it, or connect and translate different data link technologies such as FDDI to Ethernet.
Gateway Server C:\Users\MCS\Desktop\1.jpg
Image Referencehttp://static.howtoforge.com/images/screenshots/556af08d5e43aa768260f9e589dc547f3024.jpg
The following answers are incorrect:
Repeater - A repeater provides the simplest type of connectivity, because it only repeats electrical signals between cable segments, which enables it to extend a network. Repeaters work at the physical layer and are add-on devices for extending a network connection over a greater distance. The device amplifies signals because signals attenuate the farther they have to travel.
Bridges - A bridge is a LAN device used to connect LAN segments. It works at the data link layer and therefore works with MAC addresses. A repeater does not work with addresses; it just forwards all signals it receives. When a frame arrives at a bridge, the bridge determines whether or not the MAC address is on the local network segment. If the MAC address is not on the local network segment, the bridge forwards the frame to the necessary network segment.
Routers - Routers are layer 3, or network layer, devices that are used to connect similar or different networks. (For example, they can connect two Ethernet LANs or an Ethernet LAN to a Token Ring LAN.) A router is a device that has two or more interfaces and a routing table so it knows how to get packets to their destinations. It can filter traffic based on access control lists (ACLs), and it fragments packets when necessary.
Following reference(s) were/was used to create this question: CISA review manual 2014 Page number 263 Official ISC2 guide to CISSP CBK 3rd Edition Page number 229 and 230
NEW QUESTION # 252
Which of the following protocols that provide integrity and authentication for IPSec, can also provide non- repudiation in IPSec?
Answer: C
Explanation:
Explanation/Reference:
As per the RFC in reference, the Authentication Header (AH) protocol is a mechanism for providing strong integrity and authentication for IP datagrams. It might also provide non-repudiation, depending on which cryptographic algorithm is used and how keying is performed. For example, use of an asymmetric digital signature algorithm, such as RSA, could provide non-repudiation.
from a cryptography point of view, so we will cover it from a VPN point of view here. IPSec is a suite of protocols that was developed to specifically protect IP traffic. IPv4 does not have any integrated security, so IPSec was developed to bolt onto IP and secure the data the protocol transmits. Where PPTP and L2TP work at the data link layer, IPSec works at the network layer of the OSI model. The main protocols that make up the IPSec suite and their basic functionality are as follows: A. Authentication Header (AH) provides data integrity, data origin authentication, and protection from replay attacks. B. Encapsulating Security Payload (ESP) provides confidentiality, data-origin authentication, and data integrity. C. Internet Security Association and Key Management Protocol (ISAKMP) provides a framework for security association creation and key exchange. D. Internet Key Exchange (IKE) provides authenticated keying material for use with ISAKMP.
The following are incorrect answers:
ESP is a mechanism for providing integrity and confidentiality to IP datagrams. It may also provide authentication, depending on which lgorithm and algorithm mode are used. Non-repudiation and protection from traffic analysis are not provided by ESP (RFC 1827).
SSL is a secure protocol used for transmitting private information over the Internet. It works by using a public key to encrypt data that is transferred of the SSL connection. OIG 2007, page 976 SSH-2 is a secure, efficient, and portable version of SSH (Secure Shell) which is a secure replacement for telnet.
Reference(s) used for this question:
Shon Harris, CISSP All In One, 6th Edition , Page 705
and
RFC 1826, http://tools.ietf.org/html/rfc1826, paragraph 1.
NEW QUESTION # 253
The IP header contains a protocol field. If this field contains the value of 1, what type of data is contained within the IP datagram?
Answer: B
Explanation:
Explanation/Reference:
If the protocol field has a value of 1 then it would indicate it was ICMP.
The following answers are incorrect:
TCP. Is incorrect because the value for a TCP protocol would be 6.
UDP. Is incorrect because the value for an UDP protocol would be 17.
IGMP. Is incorrect because the value for an IGMP protocol would be 2.
NEW QUESTION # 254
What is the primary role of smartcards in a PKI?
Answer: C
Explanation:
Reference: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, 2001, McGraw-Hill/Osborne, page 139;
SNYDER, J., What is a SMART CARD?.
Wikipedia has a nice definition at: http://en.wikipedia.org/wiki/Tamper_resistance
Security
Tamper-resistant microprocessors are used to store and process private or sensitive information, such as private keys or electronic money credit. To prevent an attacker from retrieving or modifying the information, the chips are designed so that the information is not accessible through external means and can be accessed only by the embedded software, which should contain the appropriate security measures.
Examples of tamper-resistant chips include all secure cryptoprocessors, such as the IBM 4758 and chips used in smartcards, as well as the Clipper chip.
It has been argued that it is very difficult to make simple electronic devices secure against tampering, because numerous attacks are possible, including:
physical attack of various forms (microprobing, drills, files, solvents, etc.)
freezing the device
applying out-of-spec voltages or power surges
applying unusual clock signals
inducing software errors using radiation
measuring the precise time and power requirements of certain operations (see power analysis)
Tamper-resistant chips may be designed to zeroise their sensitive data (especially cryptographic keys) if they detect penetration of their security encapsulation or out-ofspecification environmental parameters. A chip may even be rated for "cold zeroisation", the ability to zeroise itself even after its power supply has been crippled.
Nevertheless, the fact that an attacker may have the device in his possession for as long as he likes, and perhaps obtain numerous other samples for testing and practice, means that it is practically impossible to totally eliminate tampering by a sufficiently motivated opponent. Because of this, one of the most important elements in protecting a system is overall system design. In particular, tamper-resistant systems should "fail gracefully" by ensuring that compromise of one device does not compromise the entire system. In this manner, the attacker can be practically restricted to attacks that cost less than the expected return from compromising a single device (plus, perhaps, a little more for kudos). Since the most sophisticated attacks have been estimated to cost several hundred thousand dollars to carry out, carefully designed systems may be invulnerable in practice.
NEW QUESTION # 255
......
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