Free JN0-649 Exam Braindumps (page: 4)

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Your enterprise network uses routing instances to support multitenancy. Your Junos devices use BGP to peer to multiple BGP devices. You must ensure that load balancing is achieved within the routing instance.
Which two statements would accomplish this task? (Choose two.)

  1. Configure the multipath option at the [edit protocols bgp group <group-name> neighbor] hierarchy.
  2. Configure the multipath option at the [edit protocols bgp group] hierarchy.
  3. Configure a load-balance per-packet policy and apply it at the [edit routing-options forwarding- table] hierarchy.
  4. Configure the multipath option at the [edit routing-instances <instance-name> routing-options] hierarchy.

Answer(s): B,C

Explanation:

Fortunately, the Juniper Networks BGP implementation supports the notion of a bandwidth community. This extended community encodes the bandwidth of a given next hop, and when combined with multipath, the load-balancing algorithm distributes flows across the set of next hops proportional to their relative bandwidths. Put another way, if you have a 10-Mbps and a 1-Mbps next hop, on average nine flows will map to the high-speed next hop for every one that uses the low speed.

Use of BGP bandwidth community is supported only with per-packet load balancing.

The configuration task has two parts:

Configure the external BGP (EBGP) peering sessions, enable multipath, and define an import policy to tag routes with a bandwidth community that reflects link speed.

Enable per-packet (really per-flow) load balancing for optimal distribution of traffic. https://www.juniper.net/documentation/us/en/software/junos/bgp/topics/topic-map/load- balancing-bgp-session.html



You are asked to enforce user authentication using a captive portal before users access the corporate network.
Which statement is correct in this scenario?

  1. HTTPS is the default protocol for a captive portal.
  2. A captive portal can be bypassed using an allowlist command containing a device's IP address.
  3. When enabled, a captive portal must be applied to each individual interface.
  4. All Web browser requests are redirected to the captive portal until authentication is successful.

Answer(s): D

Explanation:

You can set up captive portal authentication on your switch to redirect all Web browser requests to a login page that requires users to input a username and password before they are allowed access. Upon successful authentication, users are allowed access to the network and redirected to the original page requested. Junos OS provides a customizable template for the captive portal window that allows you to easily design and modify the look of the captive portal login page. You can modify the design elements of the template to change the look of your captive portal login page and to add instructions or information to the page. You can also modify any of the design elements of a captive portal login page. The first screen displayed before the captive login page requires the user to read the terms and conditions of use. By clicking the Agree button, the user can access the captive portal login page. https://www.juniper.net/documentation/us/en/software/junos/user-access/topics/topic- map/user-authentication-captive-portal.html



Referring to the exhibit, ServerA sends a single IP packet destined to 10.0.0.127.
Which two statements correctly describe the behavior of the resulting outbound VXLAN packets that contain the original packet destined to 10.0.0.127? (Choose two.)

  1. Router E will replicate and send a copy of the received VXLAN packet to router D.
  2. Router C will send a VXLAN packet destined only to router D and router E.
  3. Router D will not replicate and send a copy of the received VXLAN packet to router E.
  4. Router C will send a single VXLAN packet to one remote VTEP.

Answer(s): A,D



A BGP network has been designed to provide resiliency and redundancy to a multihomed customer network.

Which two statements are correct in this scenario? (Choose two.)

  1. Both the next hops will be used to forward traffic to R2.
  2. A routing policy will be required to forward traffic to both next hops.
  3. The TTL value of 1 is set to limit the scope of the EBGP session.
  4. The ttl statement must be configured to accommodate peering to a loopback address of a directly connected peer.

Answer(s): B,D



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