Classification and Packet Loss Priority JN0-650 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   Which Junos configuration element associates a drop profile with a forwarding class?

   • AFirewall filter
   • BRewrite rule
   • CClassifier
   • DScheduler
   Reveal Solution Discussion Select an answer first
2. 2application · medium

   A network engineer is configuring CoS on a Junos router. The router has four forwarding classes: expedited-forwarding (EF), assured-forwarding (AF), best-effort (BE), and network-control (NC). The engineer wants to ensure that all traffic arriving on a specific interface is classified into the BE forwarding class, regardless of any DSCP or 802.1p markings. What is the most efficient configuration to achieve this?

   • AApply a rewrite rule to the interface that sets the DSCP value to BE on egress.
   • BApply a BA classifier to the interface that maps all DSCP values to the BE forwarding class.
   • CApply an MF classifier using a firewall filter that matches all traffic and sets the forwarding class to BE.
   • DConfigure the default forwarding class for the interface to BE and do not apply any classifier.
   Reveal Solution Discussion Select an answer first
4. 3foundation · easy

   What is the default forwarding class for packets that are not explicitly classified in Junos?

   • Aexpedited-forwarding
   • Bbest-effort
   • Cnetwork-control
   • Dassured-forwarding
   Reveal Solution Discussion Select an answer first
5. 4application · medium

   A service provider is deploying a new access switch for a customer that sends voice, video, and best-effort data. The customer's endpoints mark voice with DSCP EF, video with DSCP AF41, and data with DSCP BE. The switch must classify these packets into the expedited-forwarding (EF), assured-forwarding (AF), and best-effort (BE) forwarding classes respectively, using only the DSCP values. The switch also needs to honor 802.1p priorities from a legacy VoIP phone that does not support DSCP. What is the most efficient way to meet these requirements?

   • AApply an MF classifier using a firewall filter that matches DSCP and 802.1p fields and assigns the packets to the appropriate forwarding classes.
   • BApply a DSCP-based BA classifier to the customer-facing interfaces and a separate 802.1p-based BA classifier to the interface connected to the legacy VoIP phone.
   • CApply a single BA classifier that maps DSCP EF to the EF class, DSCP AF41 to the AF class, and DSCP BE to the BE class, and also maps 802.1p values to the same classes.
   • DApply a default BA classifier and configure rewrite rules on egress to set DSCP and 802.1p values based on the forwarding class.
   Reveal Solution Discussion Select an answer first
6. 5application · medium

   A network administrator is configuring CoS on a Junos router. The router has four forwarding classes: EF, AF, BE, and NC. The administrator wants to ensure that traffic classified into the EF forwarding class is mapped to queue 0, AF to queue 1, BE to queue 2, and NC to queue 3. What is the correct configuration?

   • AConfigure a scheduler map that assigns each forwarding class to the desired queue number.
   • BConfigure a BA classifier that maps each forwarding class to the desired queue number.
   • CConfigure a firewall filter that maps each forwarding class to the desired queue number.
   • DConfigure a rewrite rule that maps each forwarding class to the desired queue number.
   Reveal Solution Discussion Select an answer first