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NEW QUESTION: 1
Which function doen PHP perform?
A. popping the two bottommont labeln one hop before the egrenn LSR
B. popping the two topmont labeln one hop before the egrenn LSR
C. popping the bottom label one hop before the egrenn LSR
D. popping the top label at the egrenn LSR
E. popping the top label one hop before the egrenn LSR
F. popping the bottom label at the egrenn LSR
Answer: E
NEW QUESTION: 2
You have an Azure subscription that contains the resources in the following table.
VM1 and VM2 are deployed from the same template and host line-of-business applications accessed by using Remote Desktop. You configure the network security group (NSG) shown in the exhibit. (Click the Exhibit button.)
You need to prevent users of VM1 and VM2 from accessing websites on the Internet.
What should you do?
A. Change the Port_80 inbound security rule.
B. Change the DenyWebSites outbound security rule.
C. Associate the NSG to Subnet1.
D. Disassociate the NSG from a network interface.
Answer: C
Explanation:
You can associate or dissociate a network security group from a network interface or subnet. The NSG has the appropriate rule to block users from accessing the Internet. We just need to associate it with Subnet1.
References: https://docs.microsoft.com/en-us/azure/virtual-network/manage-network-security-group
NEW QUESTION: 3
What is a cause for unicast flooding?
A. Forwarding table overflow prevents new MAC addresses from being learned, and packets destined to those MAC addresses are flooded until space becomes available in the forwarding table.
B. When PIM snooping is not enabled, unicast flooding occurs on the switch that interconnects the PIM-enabled routers.
C. Unicast flooding occurs when multicast traffic arrives on a Layer 2 switch that has directly connected multicast receivers.
D. A man-in-the-middle attack can cause the ARP cache of an end host to have the wrong MAC address. Instead of having the MAC address of the default gateway, it has a MAC address of the man-in-the-middle. This causes all traffic to be unicast flooded through the man-in-the-middle, which can then sniff all packets.
Answer: A
Explanation:
Causes of Flooding
The very cause of flooding is that destination MAC address of the packet is not in the L2 forwarding table of the switch. In this case the packet will be flooded out of all forwarding ports in its VLAN (except the port it was received on). Below case studies display most common reasons for destination MAC address not being known to the switch.
Cause 1: Asymmetric Routing
Large amounts of flooded traffic might saturate low-bandwidth links causing network performance issues or complete connectivity outage to devices connected across such low-bandwidth links
Cause 2: Spanning-Tree Protocol Topology Changes
Another common issue caused by flooding is Spanning-Tree Protocol (STP) Topology Change Notification (TCN). TCN is designed to correct forwarding tables after the forwarding topology has changed. This is necessary to avoid a connectivity outage, as after a topology change some destinations previously accessible via particular ports might become accessible via different ports. TCN operates by shortening the forwarding table aging time, such that if the address is not relearned, it will age out and flooding will occur
Cause 3: Forwarding Table Overflow
Another possible cause of flooding can be overflow of the switch forwarding table. In this case, new addresses cannot be learned and packets destined to such addresses are flooded until some space becomes available in the forwarding table. New addresses will then be learned. This is possible but rare, since most modern switches have large enough forwarding tables to accommodate MAC addresses for most designs.
Reference:
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6000-series-switches/23563143.html