Packet Loss Priority JN0-664 Practice Questions (Page 5)

Questions 21–23

1. 21foundation · easy

   How does a rewrite rule use packet loss priority (PLP) when marking an outgoing packet?

   • AIt selects the CoS bits to write based on the combination of forwarding class and PLP.
   • BIt sets the PLP of the packet based on the outgoing interface's congestion level.
   • CIt uses PLP to select the drop profile for the outgoing queue.
   • DIt ignores PLP and only uses the forwarding class.
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2. 22application · medium

   A service provider is implementing CoS on a network where traffic enters from a customer edge (CE) router and is then forwarded to a provider edge (PE) router. The PE router needs to preserve the PLP marking set by the CE router across the provider network. What should the PE router be configured to do?

   • AApply a BA classifier on the ingress interface that maps the incoming DSCP to the same forwarding class and PLP.
   • BConfigure a drop profile that uses the PLP from the incoming packet header.
   • CApply a rewrite rule on the ingress interface to copy the PLP from the incoming packet header.
   • DEnable a firewall filter to set the PLP based on the source IP address.
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3. 23foundation · easy

   In a Junos CoS classifier, how is the packet loss priority (PLP) value assigned to an incoming packet?

   • AIt is set based on the packet's existing CoS bits (e.g., DSCP or 802.1p) according to the classifier's mapping table.
   • BIt is derived from the forwarding class assigned by the classifier.
   • CIt is always set to low for all packets.
   • DIt is determined by the scheduler configuration.
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