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NEW QUESTION: 1
Your network contains a single Active Directory domain. The domain contains a server named Server1 that runs Windows Server 2008 IC
Server1 has an SCSI host bus adapter that connects to an iSCSI target.
You install an additional iSCSI host bus adapter on Server1.
You need to ensure that Server1 can access the iSCSI target if a host bus adapter fails.
What should you do first?
A. Bridge the iSCSI host bus adapters.
B. At the command prompt, run mpclairn.exe -I -m 6.
C. Install the Internet Storage Name Server (iSNS) feature.
D. Install the Multipath I/O feature.
Answer: D
Explanation:
The old answer was: Bridge the iSCSI host bus adapters.
About MPIO
Microsoft Multipath I/O (MPIO) is a Microsoft-provided framework that allows storage
providers to develop multipath solutions that contain the hardware-specific information
needed to optimize connectivity with their storage arrays. These modules are called device-
specific modules (DSMs). The concepts around DSMs are discussed later in this
document.
MPIO is protocol-independent and can be used with Fibre Channel, Internet SCSI (iSCSI),
and Serial Attached SCSI (SAS) interfaces in Windows Server 2008 and Windows Server
2008 R2.
Multipath solutions in Windows Server 2008 R2 When running on Windows Server 2008
R2, an MPIO solution can be deployed in the following ways:
*By using a DSM provided by a storage array manufacturer for Windows Server 2008 R2 in a Fibre Channel, iSCSI, or SAS shared storage configuration.
*By using the Microsoft DSM, which is a generic DSM provided for Windows Server 2008 R2 in a Fibre Channel, iSCSI, or SAS shared storage configuration.
High availability through MPIO MPIO allows Windows to manage and efficiently use up to 32 paths between storage devices and the Windows host operating system. MPIO provides fault tolerant connectivity to storage. By employing MPIO users are able to mitigate the risk of a system outage at the hardware level. MPIO provides the logical facility for routing I/O over redundant hardware paths connecting server to storage.
These redundant hardware paths are made up of components such as cabling, host bus adapters (HBAs), switches, storage controllers, and possibly even power. MPIO solutions logically manage these redundant connections so that I/O requests can be rerouted if a component along one path fails.
As more and more data is consolidated on storage area networks (SANs), the potential loss of access to storage resources is unacceptable. To mitigate this risk, high availability solutions, such as MPIO, have now become a requirement. Source: http://technet.microsoft.com/en-us/library/ee619734(WS.10).aspx
NEW QUESTION: 2
How many bits is the address space reserved for the source IP address within an IPv6 header?
A. 0
B. 1
C. 2
D. 3
Answer: A
Explanation:
Discussion: An IPv6 address space is 128 bits or:
2128 = 340,282,366,920,938,463,463,374,607,431,768,211,456
When IPv4 was conceived in the late 1970s they thought that we would never need 4.3
Billion addresses but we ran out of them years ago. It is not likely that we will ever run out of addresses any time soon with numbers like those.
We've gotten by with IPv4 by using NAT - Network Address Translation where private IP
Addresses are used by a single or a few externally routable IP Addresses.
Unfortunately, early on companies were given huge blocks of address spaces like class A networks with 224 or 16,777,216 addresses even when only a small handful were used within the company. Also, 127.0.0.0 loopback wasted as many.
IPv6 addresses are written in 8 groups of 4 hexadecimal digits separated by colons like this:
2001:0db8:85a3:0000:0000:8a2e:0370:7334
What is an IPv6 Header?
An Internet Protocol version 6 (IPv6) data packet comprises of two main parts: the header and the payload. The first 40 bytes/octets (40x8 = 320 bits) of an IPv6 packet comprise of the header (see Figure 1) that contains the following fields:
IPv6
Source address (128 bits) The 128-bit source address field contains the IPv6 address of the originating node of the packet. It is the address of the originator of the IPv6 packet.
Destination address (128 bits) The 128-bit contains the destination address of the recipient node of the IPv6 packet. It is the address of the intended recipient of the IPv6 packet.
Version/IP version (4-bits) The 4-bit version field contains the number 6. It indicates the version of the IPv6 protocol. This field is the same size as the IPv4 version field that contains the number 4. However, this field has a limited use because IPv4 and IPv6 packets are not distinguished based on the value in the version field but by the protocol type present in the layer 2 envelope.
Packet priority/Traffic class (8 bits) The 8-bit Priority field in the IPv6 header can assume different values to enable the source node to differentiate between the packets generated by it by associating different delivery priorities to them. This field is subsequently used by the originating node and the routers to identify the data packets that belong to the same traffic class and distinguish between packets with different priorities.
Flow Label/QoS management (20 bits) The 20-bit flow label field in the IPv6 header can be used by a source to label a set of packets belonging to the same flow. A flow is uniquely identified by the combination of the source address and of a non-zero Flow label. Multiple active flows may exist from a source to a destination as well as traffic that are not associated with any flow (Flow label = 0).
The IPv6 routers must handle the packets belonging to the same flow in a similar fashion.
The information on handling of IPv6 data packets belonging to a given flow may be specified within the data packets themselves or it may be conveyed by a control protocol such as the RSVP (Resource reSerVation Protocol).
When routers receive the first packet of a new flow, they can process the information carried by the IPv6 header, Routing header, and Hop-by-Hop extension headers, and store the result (e.g. determining the retransmission of specific IPv6 data packets) in a cache memory and use the result to route all other packets belonging to the same flow (having the same source address and the same Flow Label), by using the data stored in the cache memory.
Payload length in bytes(16 bits) The 16-bit payload length field contains the length of the data field in octets/bits following the IPv6 packet header. The 16-bit Payload length field puts an upper limit on the maximum packet payload to 64 kilobytes. In case a higher packet payload is required, a Jumbo payload extension header is provided in the IPv6 protocol. A
Jumbo payload (Jumbogram) is indicated by the value zero in the Payload Length field.
Jumbograms are frequently used in supercomputer communication using the IPv6 protocol to transmit heavy data payload.
Next Header (8 bits) The 8-bit Next Header field identifies the type of header immediately following the IPv6 header and located at the beginning of the data field (payload) of the
IPv6 packet. This field usually specifies the transport layer protocol used by a packet's payload. The two most common kinds of Next Headers are TCP (6) and UDP (17), but many other headers are also possible. The format adopted for this field is the one proposed for IPv4 by RFC 1700. In case of IPv6 protocol, the Next Header field is similar to the IPv4
Protocol field.
Time To Live (TTL)/Hop Limit (8 bits) The 8-bit Hop Limit field is decremented by one, by each node (typically a router) that forwards a packet. If the Hop Limit field is decremented to zero, the packet is discarded. The main function of this field is to identify and to discard packets that are stuck in an indefinite loop due to any routing information errors. The 8-bit field also puts an upper limit on the maximum number of links between two IPv6 nodes. In this way, an IPv6 data packet is allowed a maximum of 255 hops before it is eventually discarded. An IPv6 data packet can pas through a maximum of 254 routers before being discarded.
In case of IPv6 protocol, the fields for handling fragmentation do not form a part of the basic header. They are put into a separate extension header. Moreover, fragmentation is exclusively handled by the sending host. Routers are not employed in the Fragmentation process.
For further details, please see RFC 2460 - Internet Protocol, Version 6 (IPv6) Specification.
The following answers are incorrect:
- 32: This answer would be right if the question was about IPv4 but it isn't so the answer is wrong. 32 Bits yields 4,294,967,296 unique IP Address and considering the RFC for that was released in 1981, IPv4 has proven to have a remarkable lifespan. After more than 30 years and the huge growth the internet it's no wonder its lifespan is coming to an end.
- 64: This is only half the size of an IPv6 header address space so this isn't correct. 64 Bits would yield a huge number of addresses which probably would have been enough but designers wanted to be sure to never ever run out of addresses on planet earth with 128-bit address spaces in IPv6.
- 256: This isn't correct because 256 is twice the size of an IPv6 address size, far to many addresses necessary at this or any other point in time.
The following reference(s) was used to create this question:
Gregg, Michael; Haines, Billy (2012-02-16). CASP: CompTIA Advanced Security
Practitioner Study Guide Authorized Courseware: Exam CAS-001 (p. 53). Wiley. Kindle
Edition.
NEW QUESTION: 3
A. Option D
B. Option A
C. Option B
D. Option C
Answer: A
Explanation:
Configuring Port Security
http://packetlife.net/blog/2010/may/3/port-security/
We can view the default port security configuration with show port-security:
http://www.ciscopress.com/articles/article.asp?p=1722561
Switchport Security Violations The second piece of switchport port-security that must be understood is a security violation including what it is what causes it and what the different violation modes that exist. A switchport violation occurs in one of two situations:
When the maximum number of secure MAC addresses has been reached (by default, the maximum number of secure MAC addresses per switchport is limited to 1)
An address learned or configured on one secure interface is seen on another secure interface in the same VLAN The action that the device takes when one of these violations occurs can be configured: Protect-This mode permits traffic from known MAC addresses to continue to be forwarded while dropping traffic from unknown MAC addresses when over the allowed MAC address limit. When configured with this mode, no notification action is taken when traffic is dropped. Restrict-This mode permits traffic from known MAC addresses to continue to be forwarded while dropping traffic from unknown MAC addresses when over the allowed MAC address limit. When configured with this mode, a syslog message is logged, a Simple Network Management Protocol (SNMP) trap is sent, and a violation counter is incremented when traffic is dropped. Shutdown-This mode is the default violation mode; when in this mode, the switch will automatically force the switchport into an error disabled (err-disable) state when a violation occurs. While in this state, the switchport forwards no traffic. The switchport can be brought out of this error disabled state by issuing the errdisable recovery cause CLI command or by disabling and re-enabling the switchport. Shutdown VLAN-This mode mimics the behavior of the shutdown mode but limits the error disabled state the specific violating VLAN.