A network uses PIM-DM to route multicast traffic. The network administrator has noticed bursts of congestion related to periodic floods of multicast traffic. How can the administrator eliminate these periodic bursts?

• A. Leave PIM-DM enabled on the interfaces that face receivers, but enable PIM-SM throughout the core.
• B. Enable the state refresh feature on the VLAN interfaces on which PIM-DM is enabled.
• C. Decrease the IGMP robustness variable on VLAN interfaces that connect to receivers.
• D. Decrease the PIM hello timer on VLAN interfaces on which PIM-DM is enabled.

View the exhibit.


PIM-SM is configured on each interface in the network and IGMP is enabled on VLAN 3 and VLAN 4, as shown in Exhibit 1. Each switch has a rendezvous point (RP) set and valid unicast routes, as shown in Exhibit 2. The network administrator configures an endpoint connected to VLAN4 to begin listening on
239.255.1.1 to verify if multicast routing configuration is established correctly. The network is not live, meaning no other hosts are sending IGMP requests. The network administrator then checks PIM routing entries on the switches to verify if the system is functioning correctly. On which switches should (*, 239.255.1.1) entries appear if the system is functioning correctly?

• A. switch B only
• B. switch C only
• C. switches B and C only
• D. switches A, B, and C

View the exhibit.

Area 1 and Area 2 in the topology are associated with/21 subnets, shown in Exhibit 1. All of the switches in this topology are HP Provision ASIC switches, and they have established the appropriate adjacencies. In Area 1, one of the/24 subnets within the/21 range, 10.1.19.0/24, is not used. The network administrator must prevent unnecessary traffic from entering Area 1 if users attempt to reach an address in the unused range. What can the administrator do that meets this requirement without disrupting the solution?

• A. Remove the stub definition for Area 1 on all routers and routing switches in Area 1.
• B. Create a static route to 10.1.19.0/24 with the black hole option on routing switch A (and other area 1 routers).
• C. Suppress the advertisement of the default route in Area 1 on routing switch B, the area border router (ABR).
• D. Enter range 10.1.19.0/24 no-summary in the OSPF configuration context of routing switch B, the area border router (ABR).

Which security protocol introduces vulnerabilities because the password is sent in plaintext and can be intercepted and easily read?

• A. PAP
• B. WEP
• C. EAP
• D. CHAP

View the exhibit.

Part of an OSPF routing table in an HP 5800 switch is shown in the exhibit. This switch is an internal switch in area 1. The network administrator views this routing table, and then reconfigures area 1 as a stub area on all relevant switches. No other changes to the OSPF domain are made. After this change takes effect, which routes shown in the exhibit will still exist in the OSPF routing table of this switch?

• A. Only the routes to 10.1.1.0/30, 10.1.10.0/24, and 172.16.0.0/16 will still exist.
• B. Only the routes to 10.1.1.0/30, 10.1.10.0/24, and 10.2.30.0/24 will still exist.
• C. Only the route to 10.1.10.0/24 will still exist.
• D. Only the routes to 10.1.1.0/30 and 10.1.10.0/24 will still exist.
• E. All of the routes will still exist.