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NEW QUESTION: 1
Unicast Reverse Path Forwarding can perform all of these actions except which one?
A. inspect IP packets encapsulated in tunnels, such as GRE
B. check to see if any packet received at a router interface arrives on the best return path
C. log its events, if you specify the logging options for the ACL entries used by the unicast rpf command
D. combine with a configured ACL
E. examine all packets received to make sure that the source addresses and source interfaces appear in the routing table and match the interfaces where the packets were received
Answer: A
Explanation:
For RPF to function, CEF must be enabled on the router. This is because the router uses the Forwarding Information Base (FIB) of CEF to perform the lookup process, which is built from the router's routing table. In other words, RPF does not really look at the router's routing table; instead, it uses the CEF FIB to determine spoofing. Also, RPF cannot detect all spoofed packets. For the network in this example, the perimeter router cannot determine spoofing from packets received on the external E1 interface if they match the default route statement. Therefore, the more routes your router has in its CEF FIB table, the more likely the router will be capable of detecting spoofing attacks. In addition, RPF cannot detect any spoofed packets that are encapsulated, such as packets encapsulated in GRE, IPSec, L2TP, and other packets. Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit the malicious traffic on an enterprise network. This security feature works by enabling a router to verify the reachability of the source address in packets being forwarded. This capability can limit the appearance of spoofed addresses on a network. If the source IP address is not valid, the packet is discarded. Unicast RPF works in one of three different modes: strict mode, loose mode, or VRF mode. Note that not all network devices support all three modes of operation. Unicast RPF in VRF mode will not be covered in this document. When administrators use Unicast RPF in strict mode, the packet must be received on the interface that the router would use to forward the return packet. Unicast RPF configured in strict mode may drop legitimate traffic that is received on an interface that was not the router's choice for sending return traffic. Dropping this legitimate traffic could occur when asymmetric routing paths are present in the network. When administrators use Unicast RPF in loose mode, the source address must appear in the routing table. Administrators can change this behavior using the allow-default option, which allows the use of the default route in the source verification process. Additionally, a packet that contains a source address for which the return route points to the Null 0 interface will be dropped. An access list may also be specified that permits or denies certain source addresses in Unicast RPF loose mode. Care must be taken to ensure that the appropriate Unicast RPF mode (loose or strict) is configured during the deployment of this feature because it can drop legitimate traffic. Although asymmetric traffic flows may be of concern when deploying this feature, Unicast RPF loose mode is a scalable option for networks that contain asymmetric routing paths. Unicast RPF in an Enterprise Network In many enterprise environments, it is necessary to use a combination of strict mode and loose mode Unicast RPF. The choice of the Unicast RPF mode that will be used will depend on the design of the network segment connected to the interface on which Unicast RPF is deployed. Administrators should use Unicast RPF in strict mode on network interfaces for which all packets received on an interface are guaranteed to originate from the subnet assigned to the interface. A subnet composed of end stations or network resources fulfills this requirement. Such a design would be in place for an access layer network or a branch office where there is only one path into and out of the branch network. No other traffic originating from the subnet is allowed and no other routes are available past the subnet. Unicast RPF loose mode can be used on an uplink network interface that has a default route associated with it.
Reference http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html

NEW QUESTION: 2
전자 상거래 웹 사이트를 포함하는 회사 네트워크에 대한 지속적인 서비스 거부 (DoS) 공격을 해결하기 위해 보안 전문가가 방금 지정되었습니다. 이 전략은 회사 네트워크를 사용할 수 없게 만들지 않고 모든 규모의 공격에 대한 방어를 포함해야 합니다.
다음 중 이 문제를 해결할 때 가장 중요한 문제는 무엇입니까?
A. 최종 사용자 교육 및 훈련을 처리합니다.
B. 합법적 인 연결을 허용하고 악성 연결을 차단합니다.
C. 인터넷 전용 경로에 더 많은 비용을 지불하십시오.
D. 웹 사이트가 매일 올바르게 백업되었는지 확인하십시오.
Answer: B

NEW QUESTION: 3
Which of the following protocol does NOT work at the Application layer of the TCP/IP Models?
A. TCP
B. FTP
C. HTTP
D. NTP
Answer: A
Explanation:
Explanation/Reference:
The NOT keyword is used in the question. You need to find out a protocol which does not work at application layer. TCP protocol works at transport layer of a TCP/IP models.
For your exam you should know below information about TCP/IP model:
Network Models

Layer 4. Application Layer
Application layer is the top most layer of four layer TCP/IP model. Application layer is present on the top of the Transport layer. Application layer defines TCP/IP application protocols and how host programs interface with Transport layer services to use the network.
Application layer includes all the higher-level protocols like DNS (Domain Naming System), HTTP (Hypertext Transfer Protocol), Telnet, SSH, FTP (File Transfer Protocol), TFTP (Trivial File Transfer Protocol), SNMP (Simple Network Management Protocol), SMTP (Simple Mail Transfer Protocol) , DHCP (Dynamic Host Configuration Protocol), X Windows, RDP (Remote Desktop Protocol) etc.
Layer 3. Transport Layer
Transport Layer is the third layer of the four layer TCP/IP model. The position of the Transport layer is between Application layer and Internet layer. The purpose of Transport layer is to permit devices on the source and destination hosts to carry on a conversation. Transport layer defines the level of service and status of the connection used when transporting data.
The main protocols included at Transport layer are TCP (Transmission Control Protocol) and UDP (User Datagram Protocol).
Layer 2. Internet Layer
Internet Layer is the second layer of the four layer TCP/IP model. The position of Internet layer is between Network Access Layer and Transport layer. Internet layer pack data into data packets known as IP datagram's, which contain source and destination address (logical address or IP address) information that is used to forward the datagram's between hosts and across networks. The Internet layer is also responsible for routing of IP datagram's.
Packet switching network depends upon a connectionless internetwork layer. This layer is known as Internet layer. Its job is to allow hosts to insert packets into any network and have them to deliver independently to the destination. At the destination side data packets may appear in a different order than they were sent. It is the job of the higher layers to rearrange them in order to deliver them to proper network applications operating at the Application layer.
The main protocols included at Internet layer are IP (Internet Protocol), ICMP (Internet Control Message Protocol), ARP (Address Resolution Protocol), RARP (Reverse Address Resolution Protocol) and IGMP (Internet Group Management Protocol).
Layer 1. Network Access Layer
Network Access Layer is the first layer of the four layer TCP/IP model. Network Access Layer defines details of how data is physically sent through the network, including how bits are electrically or optically signaled by hardware devices that interface directly with a network medium, such as coaxial cable, optical fiber, or twisted pair copper wire.
The protocols included in Network Access Layer are Ethernet, Token Ring, FDDI, X.25, Frame Relay etc.
The most popular LAN architecture among those listed above is Ethernet. Ethernet uses an Access Method called CSMA/CD (Carrier Sense Multiple Access/Collision Detection) to access the media, when Ethernet operates in a shared media. An Access Method determines how a host will place data on the medium.
IN CSMA/CD Access Method, every host has equal access to the medium and can place data on the wire when the wire is free from network traffic. When a host wants to place data on the wire, it will check the wire to find whether another host is already using the medium. If there is traffic already in the medium, the host will wait and if there is no traffic, it will place the data in the medium. But, if two systems place data on the medium at the same instance, they will collide with each other, destroying the data. If the data is destroyed during transmission, the data will need to be retransmitted. After collision, each host will wait for a small interval of time and again the data will be retransmitted.
Protocol Data Unit (PDU):
Protocol Data Unit - PDU

The following answers are incorrect:
HTTP, FTP and NTP protocols works at application layer in TCP/IP model.
The following reference(s) were/was used to create this question:
CISA review manual 2014 page number 272

NEW QUESTION: 4
Your network contains an Active Directory forest named contoso.com
Your company plans to hire 500 temporary employees for a project that will last 90 days.
You create a new user account for each employee. An organizational unit (OU) named Temp contains the
user accounts for the employees.
You need to prevent the new users from accessing any of the resources in the domain after 90 days.
What should you do?
A. Create a group that contains all of the users in the Temp OU. Create a Password Setting object (PSO)
for the new group.
B. Run the GET-ADOrganizationalUnit cmdlet and pipe the output to the Set-Date cmdlet.
C. Create a Group Policy object (GPO) and link the GPO to the Temp OU. Modify the Password Policy
settings of the GPO.
D. Run the Get-ADUser cmdlet and pipe the output to the Set-ADUser cmdlet.
Answer: D
Explanation:
Explanation/Reference:
Explanation: