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NEW QUESTION: 1
Multiple computers are connected to a hub near a wall plate. In order to get to the computers, students step on and around the cable that connects the teacher's station, a few feet away, to the same hub. The teacher is experiencing no network connectivity. Which of the following is MOST likely the problem?
A. Cross-talk
B. Distance
C. EMI
D. Split cables
Answer: D

NEW QUESTION: 2

A. Get-NetIPAddress
B. dnscmd.exe
C. Resolve-DNSName
D. nslookup.exe
Answer: C
Explanation:
The Resolve-DnsName cmdlet performs a DNS query for the specified name. This cmdlet
is functionally similar to the nslookup tool which allows users to query for names. The
Resolve-DnsName cmdlet was introduced in Windows Server 2012 and Windows 8 and
can be used to display DNS queries that include DNSSEC data.
Parameters include:
* -DnssecOk
Sets the DNSSEC OK bit for this query.
* -DnssecCd
Sets the DNSSEC checking-disabled bit for this query
Example: In the following example, the DO=1 flag is set by adding the dnssecok
parameter.
PS C:\> resolve-dnsname -name finance.secure.contoso.com -type A -server
dns1.contoso.com -dnssecok
Incorrect:
Not A: Do not use the nslookup command-line tool to test DNSSEC support for a zone. The
nslookup tool uses an internal DNS client that is not DNSSEC-aware.
Reference: Resolve-DnsName
https://technet.microsoft.com/library/jj590781.aspx
Reference: Overview of DNSSEC
https://technet.microsoft.com/en-us/library/jj200221.aspx#validation

NEW QUESTION: 3
ユニキャストリバースパス転送の3つのモードは何ですか？
A. 厳密モード、ルーズモード、およびVRFモード
B. 厳密モード、ブロードキャストモード、およびVRFモード
C. 厳格モード、ルーズモード、およびブロードキャストモード
D. ブロードキャストモード、ルーズモード、およびVRFモード
Answer: A
Explanation:
Explanation

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.
Reference: http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html