CCIE routing and switching is a certification that every expert engineer needs to undertake in order to plan, operate and troubleshoot converged network infrastructure. Take up the candid test on CCIE- r&s- bgp quiz below and get ready for the upcoming test next week. All the best and keep revising!
NEXT_HOP is reachable (the router has a route in its routing table.
The route is synchronized by IGP
The NLRI is an ATOMIC AGGREGATOR
The router has an interface connected to the ORIGIN Path Attribute
The AS_PATH contains the NEXT_HOP
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True
False
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Using multicast address 224.0.0.2 (all routers)
Using unicast neighbor address to TCP port 179
Using unicast neighbor address to UDP port 520
Using reliable layer 3 protocol (IP/112)
Using multicast address 224.0.0.2 to UDP port 1985
Using multicast address 224.0.0.2 to UDP port 3222
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5 seconds
15 seconds
30 seconds
60 seconds
120 seconds
180 seconds
240 seconds
300 seconds
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5 seconds
15 seconds
30 seconds
60 seconds
120 seconds
180 seconds
240 seconds
300 seconds
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When the neighbor is in the same confederation
R1(config)# router bgp 3 internal
The command: neighbor 1.1.1.1 peer-internal
When the neighbor is in the same AS
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Modify the NEXT_HOP attribute advertised to a neighbor
Strip Private AS from the AS_PATH attribute advertised to a neighbor
Determine the NLRI used to reach a neighbor
Determine the source IP address used to reach a neighbor
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By the NEXT_HOP attribute advertised by a neighbor
Manually configured using the neighbor command
Send in the HELLO messages by neighbor
Define within the peer-group of the confederation
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True
False
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Plain Text
MD5
None. BGP does not support authentication
RADIUS
EAP
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Configure two static route to the other loopback address (on for 10.1.34.0/24 and 10.1.134.0/24). Configure neighbor 3.3.3.3 update-source looback0 and neighbor 3.3.3.3 ebgp-multihop 2(on R4).
EBGP neighbor command should use aggregator option
Nothing, eBGP will load balance automatically
EBGP neighbor command should use peer-group option
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EBGP neighbor command should use update-source with loopback IP address
EBGP neighbor command should use ebgp-peer option
Nothing, eBGP will advertise connected loopback automatically
EBGP neighbor command should use ebgp-multihop option
Listen on port TCP 179
The router initiate TCP connection with that neighbor
The router formed TCP connection with that neighbor
The router sent OPEN message to that neighbor
The router received OPEN message from that neighbor
The router has Established a BGP connection with that neighbor
None of the above
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Listen on port TCP 179
The router initiate TCP connection with that neighbor
The router formed TCP connection with that neighbor
The router sent OPEN message to that neighbor
The router received OPEN message from that neighbor
The router has Established a BGP connection with that neighbor
None of the above
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Listen on port TCP 179
The router initiate TCP connection with that neighbor
The router formed TCP connection with that neighbor
The router sent OPEN message to that neighbor
The router received OPEN message from that neighbor
The router has Established a BGP connection with that neighbor
None of the above
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They stay in "Open Sent" state
They use the lower keepalive timer value
They use the higher keepalive timer value
They stay in "Connect" state
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Hello
Advertisement
Update
Notification
Reset
Open
KeepAlive
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Hello
Advertisement
Update
Notification
Reset
Open
KeepAlive
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Hello
Advertisement
Update
Notification
Reset
Open
KeepAlive
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Hello
Advertisement
Update
Notification
Reset
Open
KeepAlive
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R1 (router-config)# reset neighbor 172.16.8.8
R1# reset bgp all
R1# clear ip bgp *
R1 (router-config)# neighbor 172.16.8.8 shutdown
R1 (router-config)# clear connections
R1 (router-config)# reset connections
R1 (router-config)# clear neighbor *
R1 (router-config)# reset neighbor *
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Debug bgp neighbor
Neighbor 10.1.1.1 log
Bgp log-neighbor-changes
Ip bgp logging
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BGP routing policies for all the Network Layer Reachability Information (NLRI) learn by BGP
BGP topology table, that holds the Network Layer Reachability Information (NLRI) learn by BGP
BGP neighbors table
BGP forwarding logic base on Path Attributes learned
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R1 (router-config)# neighbor 172.16.8.8 soft-reset
R1# reset bgp soft
R1# clear ip bgp * soft
R1 (router-config)# neighbor 172.16.8.8 shutdown soft
R1 (router-config)# clear connections
R1 (router-config)# reset connections
R1 (router-config)# clear neighbor * soft
R1 (router-config)# reset neighbor *
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Activate BGP process on the corresponding interface (on subnet 10.1.1.0/24)
If 10.1.1.0/24 exactly match an entry in the current IP routing table, then put the equivalent NLRI in the local BGP topology table.
BGP will start advertising udpate message to its neighbors for any networks 10.0.0.0 in the current local IP routing table.
Send Open messages on network 10.1.1.0/24 to establish a connection with a neighbor
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Activate BGP process on the corresponding interface (on subnet 10.1.1.0/24)
If 10.1.1.0/24 exactly match an entry in the current IP routing table, then put the equivalent NLRI in the local BGP topology table.
BGP will start advertising udpate message to its neighbors for network 10.0.0.0/8 if an entry is found in the current local IP routing table.
Send Open messages on network 10.1.1.0/24 to establish a connection with a neighbor
If 10.0.0.0 match an entry in the current IP routing table, then put the equivalent NLRI in the local BGP topology table.
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Activate BGP process on the corresponding interface (on subnet 10.1.1.0/24)
If 10.1.1.0/24 exactly match an entry in the current IP routing table, then put the equivalent NLRI in the local BGP topology table.
BGP will start advertising udpate message to its neighbors for any networks 10.0.0.0 in the current local IP routing table.
Send Open messages on network 10.1.1.0/24 to establish a connection with a neighbor
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RTC sets the local preference to 150 of all updates going out to neighbor 128.213.11.2
RTC sets the local preference to 150 of all updates going out to neighbor 1.1.1.1
RTC sets the local preference to 150 of all updates advertized by neighbor 128.213.11.2
RTC sets the local preference to 150 of all updates advertized by neighbor 1.1.1.1
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Allows a neighbor connection between two external peers that do not have direct connection.
Implementation of BGP confederation over two links, using static routes in order to use loopback interface
Workaround in order to achieve load balancing between two eBGP speakers over parallel links.
Allows RTA router to advertise, or reflect, iBGP learned routes to other iBGP speakers.
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Allows RTC to have a neighbor connection with 2.2.2.2 peer that with which it does not have direct connection.
Implementation of BGP confederation with 2.2.2.2
Workaround in order to achieve load balancing between two eBGP speakers over parallel links.
Allows RTC router to advertise, iBGP learned routes to 2.2.2.2 and 3.3.3.3 iBGP speakers.
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If a route matches the IP address 170.10.0.0/16, set its BGP metric (MED) to 2, otherwise set the metric of all others routes injected into BGP to 5.
If a route matches the IP address 170.10.0.0/16, set its BGP metric (MED) to 2, otherwise set the metric of all others routes injected into RIP to 5.
If a route matches the IP address 170.20.0.0/16, set its BGP metric (MED) to 2 If a route matches the IP address 170.30.0.0/16, set its BGP metric (MED) to 5. Otherwise, don`t change the metric
If a route matches the IP address 170.20.0.0/16, set its RIP metric (MED) to 2 If a route matches the IP address 170.30.0.0/16, set its RIP metric (MED) to 5. Otherwise, don`t change the metric
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10.1.0.0/16
10.2.0.0/24
None
10.0.0.0
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10.1.0.0/16
10.2.0.0/24
None
10.0.0.0
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R1(config-router)#network 0.0.0.0
R1(config-router)#redistribute default-information originate
R1(config-router)#default-information originate R1(config-router)#redistribute static
R1(config-router)#neighbor 1.1.1.1 default-originate
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R1(config-router)#network 0.0.0.0
R1(config-router)#default-information originate
R1(config-router)#redistribute static
R1(config-router)#neighbor 1.1.1.1 default-originate
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NLRI 10.2.0.0/16 will be added into the BGP table
NLRI 10.2.0.0/16 will be advertised to its neighbors
NLRI 10.2.0.0/24 will be advertised to its neighbors
NLRI 10.2.1.0/24 will be advertised to its neighbors
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NLRI 10.2.0.0/16 will be added into the BGP table
NLRI 10.2.0.0/16 will be advertised to its neighbors
NLRI 10.2.0.0/24 will be advertised to its neighbors
NLRI 10.2.1.0/24 will be advertised to its neighbors
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Does not change the NEXT_HOP (uses the one in the routing table)
Change the NEXT_HOP to the update source IP address
Summarizes using the classful network of any subnets
BGP does not advertise routes to an iBGP neighbor
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Does not change the NEXT_HOP (uses the one in the routing table)
Change the NEXT_HOP to the update source IP address
Summarizes using the classful network of any subnets
BGP does not advertise routes to an iBGP neighbor
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Using BGP subcommand "network Net_IP mask Net_MASK backdoor" for each desired Network.
Using BGP subcommand "distance AD Net_IP Net_WILDMASK" for each desired Network.
Using BGP subcommand "distance bgp EBGP_AD IBGP_AD LOCAL_AD"
Using BGP subcommand "confederation EBGP_AD IBGP_AD LOCAL_AD"
Using BGP subcommand "bgp peer
4001 is the true AS of this network
4002 4003 4004 4005 4006 4007 are the true AS of this network
5 is the true AS of this network
4001 is one of the Confederation AS of this network
4002 4003 4004 4005 4006 4007 are Confederation AS of this network
5 is one of the Confederation AS of this network
This router uses key chain 5 to authentication with others confederation
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True
False
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True
False
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True
False
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True
False
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Routes learned from 2.2.2.2 will be advertised to all neighbors
Routes learned from 2.2.2.2 will be advertised to 1.1.1.1 only
Routes learned from 7.7.7.7 will be advertised to all neighbors
Routes learned from 7.7.7.7 will be advertised to 1.1.1.1 and 2.2.2.2 only
Routes learned from 7.7.7.7 will be advertised to 8.8.8.8 only
Routes learned from 8.8.8.8 will be advertised to all neighbors
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RR add their Cluster-ID into the CLUSTER_LIST Path Attrubute before sending an update. So if the RR receives a NLRI with its ID, the prefix will be discarded.
Set the iBGP update messages TTL to 1.
ORIGINATOR_ID Path Attribute constains the RID of the first iBGP peer that advertise the route. So if a iBGP router sees its RID it will discard it.
RR reflect only its Best routes based on its BGP table.
RR must be implemented within a confederation, then using eBGP to prevent loop.
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Ip as-path access-list 1 permit .*
Ip as-path access-list 1 permit *
Ip as-path access-list 1 permit any
Access-list 1 permit *
Access-list 1 permit any any
Access-list 1 permit any
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