READ Free Dumps For Cisco- 400-101
| Question ID 18571 | You are configuring Wireshark on a Cisco Catalyst 4500E Switch with a Supervisor 8.
Which three actions can you take to prevent the capture from overloading the CPU?
(Choose three.)
|
| Option A | Attach the specific ports that are part of the data path.
|
| Option B | Use an in-line filter.
|
| Option C | Use an appropriate ACL.
|
| Option D | Add memory to the Supervisor.
|
| Option E | Reconfigure the buffers to accommodate the additional traffic.
|
| Option F | Configure a policy map, class map, and an access list to express the match conditions.
|
| Correct Answer | A,B,C |
Explanation Explanation: Because packet forwarding typically occurs in hardware, packets are not copied to the CPU for software processing. For Wireshark packet capture, packets are copied and delivered to the CPU, which causes an increase in CPU usage. To avoid high CPU, do the following: ✑ Attach only relevant ports. ✑ Use a class map, and secondarily, an access list to express match conditions. If neither is viable, use an explicit, in-line filter. ✑ Adhere closely to the filter rules. Restrict the traffic type (such as, IPv4 only) with a restrictive, rather than relaxed ACL, which elicits unwanted traffic. Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/15-1- 2/XE_340/configuration/guide/config/wireshrk.pdf
| Question ID 18572 | Which statement is true about MLD?
|
| Option A | MLD v1 gives hosts the ability to receive multicast packets from specific source addresses.
|
| Option B | All MLD messages are sent with a link-local IPv6 source address of FF02::D.
|
| Option C | The multicast address field is cleared to zero when sending an MLD report message.
|
| Option D | MLD is used by IPv6 routers to discover multicast listeners on a directly attached link.
|
| Correct Answer | D |
Explanation Explanation: IPv6 Multicast Listener Discovery (MLD) is used by IPv6 devices to discover multicast listeners (nodes that want to receive multicast packets destined for specific multicast addresses) on directly attached links. There are two versions of MLD. MLD version 1 is based on version 2 of the IGMP for IPv4, and MLD version 2 is based on version 3 of the IGMP for IPv4. IPv6 multicast for Cisco software uses both MLD version 2 and MLD version 1. Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_lsm/configuration/xe- 3s/imc-lsm-xe-3s-book/ipv6-mcast-mld-xe.html