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NEW QUESTION: 1
HOTSPOT
Your network contains a DNS server named Server1 that runs Windows Server 2012 R2. Server1 has a zone named contoso.com. The network contains a server named Server2 that runs Windows Server 2008 R2. Server1 and Server2 are members of an Active Directory domain named contoso.com.
You change the IP address of Server2.
Several hours later, some users report that they cannot connect to Server2.
On the affected users' client computers, you flush the DNS client resolver cache, and the users successfully connect to Server2.
You need to reduce the amount of time that the client computers cache DNS records from contoso.com.
Which value should you modify in the Start of Authority (SOA) record? To answer, select the appropriate setting in the answer area.
Hot Area:

Answer:
Explanation:

Explanation/Reference:
The Default TTL, is just that a default for newly created records. Once the records are created their TTL is independent of the Default TTL on the SOA. Microsoft DNS implementation copies the Default TTL setting to all newly created records their by giving them all independent TTL settings.
SOA Minimum Field: The SOA minimum field has been overloaded in the past to have three different meanings, the minimum TTL value of all RRs in a zone, the default TTL of RRs which did not contain a TTL value and the TTL of negative responses.
Despite being the original defined meaning, the first of these, the minimum TTL value of all RRs in a zone, has never in practice been used and is hereby deprecated. The second, the default TTL of RRs which contain no explicit TTL in the master zone file, is relevant only at the primary server. After a zone transfer all RRs have explicit TTLs and it is impossible to determine whether the TTL for a record was explicitly set or derived from the default after a zone transfer. Where a server does not require RRs to include the TTL value explicitly, it should provide a mechanism, not being the value of the MINIMUM field of the SOA record, from which the missing TTL values are obtained. How this is done is implementation dependent.
TTLs also occur in the Domain Name System (DNS), where they are set by an authoritative name server for a particular resource record. When a caching (recursive) nameserver queries the authoritative nameserver for a resource record, it will cache that record for the time (in seconds) specified by the TTL. If a stub resolver queries the caching nameserver for the same record before the TTL has expired, the caching server will simply reply with the already cached resource record rather than retrieve it from the authoritative nameserver again.
Shorter TTLs can cause heavier loads on an authoritative nameserver, but can be useful when changing the address of critical services like Web servers or MX records, and therefore are often lowered by the DNS administrator prior to a service being moved, in order to minimize disruptions.



Reference:
http://support.microsoft.com/kb/297510/en-us
http://support.microsoft.com/kb/297510/en-us
https://en.wikipedia. org/wiki/Time_to_live
http://www.faqs.org/rfcs/rfc2308.html#ixzz0qVpTEitk

NEW QUESTION: 2
An engineer requires authentication for WPA2 that will use fast rekeying to enable clients to roam from one access point to another without going through the controller. Which security option should be configured?
A. Cisco Centralized Key Management
B. AES
C. PSK
D. 802.1x
Answer: A
Explanation:
Explanation/Reference:
Explanation: Cisco Centralized Key Management (CCKM) is the first fast-secure roaming method developed and implemented on enterprise WLANs, created by Cisco as the solution used in order to mitigate the delays explained thus far, when 802.1X/EAP security is used on the WLAN. As this is a Cisco proprietary protocol, it is only supported by Cisco WLAN infrastructure devices and wireless clients (from multiple vendors) that are Cisco Compatible Extension (CCX)-compatible for CCKM.
CCKM can be implemented with all of the different encryption methods available for WLANs, to include:
WEP, TKIP, and AES. It is also supported with most of the 802.1X/EAP authentication methods used for WLANs, dependent upon the CCX version supported by the devices.
Reference: http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/116493- technote-technology-00.html#anc8

NEW QUESTION: 3
You have decided to use the Automatic SavVol Extension. For a Celerra of 200 GB a SavVol with 20 GB is created.
What is the size of the next Automatic SavVol Extension when HWM is reached?
A. 20 MB
B. 64 MB
C. 64 GB
D. 20 GB
Answer: D

NEW QUESTION: 4
An organization identifies a number of hosts making outbound connections to a known malicious IP over port TCP 80. The organization wants to identify the data being transmitted and prevent future connections to this IP. Which of the following should the organization do to achieve this outcome?
A. Use a protocol analyzer to reconstruct the data and implement a web-proxy.
B. Deploy a web-proxy and then blacklist the IP on the firewall.
C. Deploy a web-proxy and implement IPS at the network edge.
D. Use a protocol analyzer to reconstruct the data and blacklist the IP on the firewall.
Answer: D