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Which two commands are required to enable multicast on a router, knowing that the receivers only
support IGMPv2? (Choose two.)
A. ip pim rp-address
B. ip pim ssm
C. ip pim sparse-mode
D. ip pim passive
Sparse mode logic (pull mode) is the opposite of Dense mode logic (push mode), in Dense mode
it is supposed that in every network there is someone who is requesting the multicast traffic so
PIM-DM routers begin by flooding the multicast traffic out of all their interfaces except those from
where a prune message is received to eliminate the
Why would a rogue host that is running a DHCP server on a campus LAN network present a
A. It may allocate IP addresses from an unknown subnet to the users.
B. All multicast traffic can be sniffed by using the DHCP multicast capabilities.
C. The CPU utilization of the first hop router can be overloaded by exploiting DHCP relay open
D. A potential man-in-the-middle attack can be used against the clients.
Which command is used to enable EtherChannel hashing for Layer 3 IP and Layer 4 port-based
A. mpls ip cef
B. port-channel ip cef
C. mpls ip port-channel cef
D. port-channel load balance
E. mpls ip load-balance
F. ip cef EtherChannel channel-id XOR L4
G. ip cef connection exchange
Which two statements are true about traffic shaping? (Choose two.)
A. Out-of-profile packets are queued.
B. It causes TCP retransmits.
C. Marking/remarking is not supported.
D. It does not respond to BECN and ForeSight Messages.
E. It uses a single/two-bucket mechanism for metering.
Which three combinations are valid LACP configurations that will set up a channel? (Choose
Refer to the exhibit.
Which statement is correct about the prefix 220.127.116.11/8?
A. The prefix has encountered a routing loop.
B. The prefix is an aggregate with an as-set.
C. The prefix has been aggregated twice, once in AS 100 and once in AS 200.
D. None of these statements is true.
What action will a BGP route reflector take when it receives a prefix marked with the community
attribute NO ADVERTISE from a client peer?
A. It will advertise the prefix to all other client peers and non-client peers.
B. It will not advertise the prefix to EBGP peers.
C. It will only advertise the prefix to all other IBGP peers.
D. It will not advertise the prefix to any peers.
Refer to the exhibit.
After a link flap in the network, which two EIGRP neighbors will not be queried for alternative
paths? (Choose two.)
Both 192.168.3.7 and 192.168.3.8 are in an EIGRP Stub area
The Enhanced Interior Gateway Routing Protocol (EIGRP) Stub Routing feature improves network
stability, reduces resource utilization, and simplifies stub router configuration.
Stub routing is commonly used in a hub and spoke network topology. In a hub and spoke network,
one or more end (stub) networks are connected to a remote router (the spoke) that is connected to
one or more distribution routers (the hub). The remote router is adjacent only to one or more
distribution routers. The only route for IP traffic to follow into the remote router is through a
distribution router. This type of configuration is commonly used in WAN topologies where the
distribution router is directly connected to a WAN. The distribution router can be connected to
many more remote routers. Often, the distribution router will be connected to 100 or more remote
routers. In a hub and spoke topology, the remote router must forward all nonlocal traffic to a
distribution router, so it becomes unnecessary for the remote router to hold a complete routing
table. Generally, the distribution router need not send anything more than a default route to the
When using the EIGRP Stub Routing feature, you need to configure the distribution and remote
routers to use EIGRP, and to configure only the remote router as a stub. Only specified routes are
propagated from the remote (stub) router. The router responds to queries for summaries,
connected routes, redistributed static routes, external routes, and internal routes with the message
“inaccessible.” A router that is configured as a stub will send a special peer information packet to
all neighboring routers to report its status as a stub router. Any neighbor that receives a packet
informing it of the stub status will not query the stub router for any routes, and a router that has a
stub peer will not query that peer. The stub router will depend on the distribution router to send the
proper updates to all peers.
Refer to the exhibit.
What triggered the first SPF recalculation?
A. changes in a router LSA, subnet LSA, and external LSA
B. changes in a router LSA, summary network LSA, and external LSA
C. changes in a router LSA, summary network LSA, and summary ASBR LSA
D. changes in a router LSA, summary ASBR LSA, and external LSA
Is built around links, and any IP prefix change in an area will trigger a full SPF. It advertises IP
information in Router and Network LSAs. The routers thus, advertise both the IP prefix information
(or the connected subnet information) and topology information in the same LSAs. This implies
that if an IP address attached to an interface changes, OSPF routers would have to originate a
Router LSA or a Network LSA, which btw also carries the topology information. This would trigger
a full SPF on all routers in that area, since the same LSAs are flooded to convey topological
change information. This can be an issue with an access router or the one sitting at the edge,
since many stub links can change regularly.
Only changes in interarea, external and NSSA routes result in partial SPF calculation (since type
3, 4, 5 and 7 LSAs only advertise IP prefix information) and thus IS-IS
Which two OSPF LSA types are new in OSPF version 3? (Choose two.)
B. NSSA external
C. Network link
D. Intra-area prefix
E. AS domain
New LSA Types
OSPFv3 carries over the seven basic LSA types we\’re familiar with from OSPFv2. However, the
type 1 and 2 LSAs have been re-purposed, as will be discussed in a bit. OSPFv3 also introduces
two new LSA types: Link and Intra-area Prefix.
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