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46 Cards in this Set
- Front
- Back
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What is the routing protocol that "glues" the Internet together |
BGP
Border Gateway Protocol |
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What does BGP stand for? |
Border Gateway Protocol |
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RIP, EIGRP, OSPF are all __________ routing protocols? |
IGP
Interior Gateway Protocls |
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When we are working with the internet being able to __________________ is more important than finding the shortest path.
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Manipulate traffic
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What is the routing Protocol that we use on the internet?
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BGP
Border Gateway Protocol |
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IANA |
Internet Assigned Numbers
They assign public IP addresses |
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AS |
Autonomous System
A collection of networks under a single administrative domain |
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For routing between different AS we use ____________ protocol?
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EGP
External Gateway Protocol |
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How do you get an Autonomous system number? |
Just like public IP address you have to register them. |
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How many bits are AS (Autonomous Systems) |
16 bits or 32 bits (Since Jan 2009) |
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What are the AS numbers? |
1-65535 |
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What are the AS Private numbers range? |
64512-65535 |
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BGP has two flavors what are they? |
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What are ISPs going to advertise to our customer network through BGP? |
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Of the 3 ways ISPs advertise to our networks what requires the fewest resources? |
Default Route |
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What could happen if you only have one default route from your ISP? |
It will only go to one location, when they may be a better option available. This is not optimal. |
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How can you check the BGP Routing table?
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show ip bgp
show ip route |
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What kind of routing protocol is BGP? |
Path-Vector |
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What does BGP guarantee? |
Loop-free routing information |
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Since BGP doesn't use metrics, what does it use? |
BGP Attributes |
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BGP is also called? |
Policy-based Routing protocol |
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Why do we call BGP a path-vector protocol? |
It maintains the path information and gets updated dynamically. |
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In BGP can you choose the path you are going to use?
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No
NOTE: You can choose the exit path, but you cannot make routing decisions for other AS |
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What will each AS advertise? |
The Best Path to your Autonomous system |
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When will your AS learn about the 2nd best Autonomous system?
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When the 1st fails
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What must you do to your neighbors when implementing BGP? |
You must configure them. |
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What command allows you to configure external BGP? |
neighbor x.x.x.x remote-as |
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If you configure your BGP correctly what will you see?
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A new BGP neighbor adjacency.
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How do you enable MD5 authentication on BGP? |
Neighbor password command |
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What is a command to see if you have a bgp neighbor? |
show ip bgp summary |
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If you want to advertise the loopback interface you can use __________ command? |
Network Command |
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If you want to advertise something with BGP you need to make sure you type ___________________ for the network you want to advertise. |
type the exact subnet mask for the network you want to advertise |
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What command allows you to look at the BGP database? |
show ip bgp |
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What command shows you the path information in BGP? |
show ip bgp |
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If you change the loopback interfaces what command do you have to use to update the information in BGP |
update-source command |
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Configuring TTL is only required for _______________ |
External BGP |
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The AS between your routing protocol and EGP is called ___ |
Transit AS |
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If your autonomous system is a transit AS you should always _____________
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Run IBGP (internal BGP) on all routers within the AS.
NOTE: If you do not run IBGP you might have reachability issues |
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When configuring an autonomous system to be an internal BGP what do you configure |
Both the routing protocol and bgp |
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When configuring IBGP how does it know it is internal BGP?
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You will use the same AS number.
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What does BGP use to setup the tcp connection to the other BGP neighbors? |
BGP will use one of the physical IP addresses to setup the TCP connection. |
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If the BGP is setup to use the loopback interface and you need it to use the physical address what command will you use? |
update-source command |
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When using the "show ip bgp" command what does the > sign mean? |
The > symbol means that this entry is the best one and has been installed in the routing table. |
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Since BGP uses the phrase "if you see your own AS number in the AS path you don't accept it since you have a loop. How do you combat this for IBGP?
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BGP Split-Horizons
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What is BGP split-horizon |
This is when a router receives an update from another internal BGP router it will not forward this information to another internal BGP router. |
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Besides advertising the link between AS in BGP or an IGP like OSPF we can also change the next hop IP address using ____________ command? |
the BGP next-hop-self command |
