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ag-Cisco CCNA 2 > 12 - Implementing eBGP > Flashcards

12 - Implementing eBGP Flashcards

1
Q

What protocol port does BGP use?

A

TCP 179

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2
Q

What is Single Homed?

A

1 Connection to 1 ISP

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3
Q

What is Dual Homed?

A

2 Connections to 1 ISP

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4
Q

What is Single Multihomed?

A

1 Connection each to 2 ISPs

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5
Q

What is Dual Multihomed?

A

2 or more connections to 2 ISPs

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6
Q

How do you pre-define neighbors in BGP?

A

neighbor remote-as ‘

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7
Q

What 3 ways are routes added to the BGP table?

A

1.) BGP network cmd 2.) Route Redistribution 3.) Learning prefixes from a neighbor

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8
Q

What is NLRI?

A

Network Layer Reachability Information

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9
Q

What is the AS_Path?

A

The list of ASNs a route must go through to reach its destination. The shorter that list is the better.

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10
Q

What routes should an enterprise router advertise to an ISP BGP peer?

A

Public address blocks only.

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11
Q

What route should an ISP BGP peer advertise to the enterprise router?

A

Default route

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12
Q

What BGP commands verify the peer relationship?

A

show tcp brief’ and ‘show ip bgp summary’

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13
Q

How can you tell whether a peer relationship is an eBGP or iBGP peer?

A

show ip bgp peer summary’ and if the ASNs are different then it’s eBGP. If same, then iBGP.

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14
Q

What are the 6 neighbor states in BGP?

A
  • Idle * Connect * Active * Opensent * Openconfirm * Established
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15
Q

What does the IDLE state mean?

A

The router has been administratively disabled or its waiting for the next retry.

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16
Q

What does the CONNECT state mean?

A

The TCP connection is being attempted but has not completed.

17
Q

What does the ACTIVE state mean?

A

The TCP connection has been completed but no BGP messages have been sent yet.

18
Q

What does the OPENSENT state mean?

A

The TCP connection exists and the router has sent the first message to establish the BGP neighbor relationship. (a BGP Open message)

19
Q

What does the OPENCONFIRM state mean?

A

The TCP connection exists and the local router has received an OPEN message from the other router. The neighbor relationship may still be rejected.

20
Q

What does the ESTABLISHED state mean?

A

The router are now neighbors/peers and can exchange update messages.

21
Q

What command administratively shuts down a neighbor?

A

neighbor 198.51.100.2 shutdown

22
Q

What command brings an adminstratively shutdown neighbor back up?

A

no neighbor 198.51.100.2 shutdown

23
Q

What command lists the BGP neighbor state?

A

show ip bgp summary’

24
Q

What does the BGP ‘network’ command do?

A

Put this prefix/ length into the BGP table, ASSUMING that prefix/ length is in the IP ROUTING TABLE.

25
Q

What is the format of the BGP ‘network’ command?

A

network mask

26
Q

How do you verify a route is in the BGP table?

A

show ip bgp’

27
Q

What does the command ‘show ip route 192.0.2.0 255.255.255.0 longer-prefixes’ do?

A

Shows all the routes in that range.

28
Q

A network engineer subnets a /24 into a /25 and a /26. ISP just wants the /24. How does the engineer get the /24 into the ip routing table?

A

Configure a static route for the /24 with an outgoing interface of null0.

29
Q

What is a route called that has an outgoing interface of null0?

A

Discard route.

30
Q

What is an Autonomous System?

A

An internetwork that is managed by a single organization.

31
Q

What is the Internet Edge?

A

The connection between an ISP Customer and the ISP.

32
Q

What is the BGP Table?

A

The table in each router, maintained by the BGP process, that holds prefixes and path attributes known to BGP.

33
Q

What is a Discard Route?

A

A static route with an outgoing interface of null0, which causes a router to discard packets that, when forwarded, happen to match that route.

ag-Cisco CCNA 2 (40 decks)

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