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29 Cards in this Set
- Front
- Back
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What is single-homed BGP? |
A BGP design with a single link between the enterprise and the ISP |
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What is dual-homed BGP? |
A BGP design with 2 links between an enterprise and the ISP |
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What is multihomed BGP? |
A BGP design with links to multiple ISPs |
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How do you predefine neighbors in BGP? |
Neighbor <ip_address> remote-as <asn> |
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What 3 ways can a prefix be learned by BGP? |
Through the "network" command, through route redistribution, or by learning prefixes from a neighbor |
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What port does BGP use? |
TCP 179 |
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What is the term BGP uses for routes? |
Network Layer Reliability Information (NLRI) |
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What command will put you in BGP configuration mode for a particular ASN? |
Router bgp <asn> |
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What does the command "show tcp brief" do? |
Shows all TCP connections that terminate at that router |
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What command will show all TCP connections that terminate at a router? |
Show tcp brief |
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What does the command "show ip bgp summary" do? |
Shows BGP peers, IP addresses, and ASNs |
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What command will list a router's BGP peers, their IP addresses, and their ASNs? |
Show ip bgp summary |
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How can you determine if a peer is using eBGP or iBGP? |
Compare ASNs |
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What does "idle" mode indicate in BGP? |
That a neighbor is shut down or waiting |
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What BGP neighbor state is a router in if its neighbor is shut down or waiting? |
Idle |
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What does a BGP neighbor state of "connect" indicate? |
That the TCP connection is starting |
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What BGP neighbor state indicates that the TCP connection is starting? |
Connect |
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What does a BGP neighbor state of "active" indicate? |
That the TCP connection is complete, but no BGP messages have been sent |
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What BGP neighbor state indicates that the TCP connection is complete, but no BGP messages have been sent? |
Active |
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What does a BGP neighbor state of "opensent" indicate? |
That the router has sent the first message to establish a neighbor relationship |
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What BGP neighbor state indicates that a router has sent the first message to establish a neighbor relationship? |
Opensent |
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What BGP neighbor state indicates that a router has received an Open message from a neighbor? |
Openconfirm |
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What does the BGP neighbor state "openconfirm" indicate? |
That the router has received an Open message from its neighbor |
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What does the BGP neighbor state "established" indicate? |
That the two routers have completed the neighbor relationship |
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What BGP neighbor state indicated that that two routers have completed a neighbor relationship? |
Established |
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What command will remove a router as a BGP neighbor? |
Neighbor <id> shutdown |
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Can BGP's "neighbor" command advertise any route? |
No, only ones that appear in the routing table |
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What command can be used to add a route to the routing table for the purpose of advertising it? |
Ip route <ip_addr> <mask> null0 |
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What kind of route can be added to the routing table for the purpose of advertising a summary? |
A discard route |
