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A company has just opened two remote branch offices that need to be connected to the corporate network. Which interface configuration output can be applied to the corporate router to allow communication to the remote sites?

A.    interface Tunnel0
bandwidth 1536
ip address
tunnel source Serial0/0
tunnel mode gre multipoint
B.    interface fa0/0
bandwidth 1536
ip address
tunnel mode gre multipoint
C.    interface Tunnel0
bandwidth 1536
ip address
tunnel source
tunnel-mode dynamic
D.    interface fa 0/0
bandwidth 1536
ip address
tunnel source
tunnel destination
tunnel-mode dynamic

Answer: A
The configuration of mGRE allows a tunnel to have multiple destinations. The configuration of mGRE on one side of a tunnel does not have any relation to the tunnel properties that might exist at the exit points. This means that an mGRE tunnel on the hub may connect to a p2p tunnel on the branch. Conversely, a p2p GRE tunnel may connect to an mGRE tunnel. The distinguishing feature between an mGRE interface and a p2p GRE interface is the tunnel destination. An mGRE interface does not have a configured destination. Instead the GRE tunnel is configured with the command tunnel mode gre multipoint. This command is used instead of the tunnel destination x.x.x.x found with p2p GRE tunnels. Besides allowing for multiple destinations, an mGRE tunnel requires NHRP to resolve the tunnel endpoints. Note, tunnel interfaces by default are point-to-
point (p-p) using GRE encapsulation, effectively they have the tunnel mode gre command, which is not seen in the configuration because it is the default.
The mGRE configuration is as follows:
interface Tunnel0
bandwidth 1536
ip address
tunnel source Serial0/0
tunnel mode gre multipoint
http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/DMVPDG/DMVPN_2_ Phase2.html

A network engineer executes the show crypto ipsec sa command. Which three pieces of information are displayed in the output? (Choose three.)

A.    inbound crypto map
B.    remaining key lifetime
C.    path MTU
D.    tagged packets
E.    untagged packets
F.    invalid identity packets

Answer: ABC
show crypto ipsec sa
This command shows IPsec SAs built between peers. The encrypted tunnel is built between and for traffic that goes between networks and You can see the two Encapsulating Security Payload (ESP) SAs built inbound and outbound. Authentication Header (AH) is not used since there are no AH SAs.
This output shows an example of the show crypto ipsec sa command (bolded ones found in answers for this question).
interface: FastEthernet0
Crypto map tag: test, local addr.
local ident (addr/mask/prot/port): ( remote ident (addr/mask/prot/port): ( current_peer:
PERMIT, flags={origin_is_acl,}
#pkts encaps: 7767918, #pkts encrypt: 7767918, #pkts digest 7767918 #pkts decaps: 7760382, #pkts decrypt: 7760382, #pkts verify 7760382 #pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0,
#pkts decompress failed: 0, #send errors 1, #Recv errors 0 local crypto endpt.:, remote crypto endpt.: path mtu 1500, media mtu 1500
current outbound spi: 3D3
inbound esp sas:
spi: 0x136A010F(325714191)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 3442, flow_id: 1443, crypto map: test sa timing: remaining key lifetime (k/sec): (4608000/52) IV size: 8 bytes
replay detection support: Y
inbound ah sas:
inbound pcp sas:
inbound pcp sas:
outbound esp sas:
spi: 0x3D3(979)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 3443, flow_id: 1444, crypto map: test sa timing: remaining key lifetime (k/sec): (4608000/52) IV size: 8 bytes
replay detection support: Y
outbound ah sas:
outbound pcp sas:

Refer to the following output:
Router#show ip nhrp detail via, Tunnel1 created 00:00:12, expire 01:59:47 TypE. dynamic, Flags: authoritative unique nat registered used
NBMA address:
What does the authoritative flag mean in regards to the NHRP information?

A.    It was obtained directly from the next-hop server.
B.    Data packets are process switches for this mapping entry.
C.    NHRP mapping is for networks that are local to this router.
D.    The mapping entry was created in response to an NHRP registration request.
E.    The NHRP mapping entry cannot be overwritten.

Answer: A

Which common issue causes intermittent DMVPN tunnel flaps?

A.    a routing neighbor reachability issue
B.    a suboptimal routing table
C.    interface bandwidth congestion
D.    that the GRE tunnel to hub router is not encrypted

Answer: A
DMVPN Tunnel Flaps Intermittently
DMVPN tunnel flaps intermittently.
When DMVPN tunnels flap, check the neighborship between the routers as issues with neighborship formation between routers may cause the DMVPN tunnel to flap. In order to resolve this problem, make sure the neighborship between the routers is always up.

Drag and Drop Question

Drag and Drop Question

Drag and Drop Question

Drag and Drop Question

Drag and Drop Question

Drag and Drop Question
Place the BGP commands to the proper locations

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