Border Gateway Protocol

Front 1

True/False: BGP Peer Groups allowing the routing table to be checked only once and updates to be replicated to all peer group members?

Back 1

True

Front 2

True/False: You should group BGP peers with routers who share the same outbound policies?

Back 2

True

Front 3

How dow you configure a BGP Peer Group named Internal?

Back 3

(config-router)neighbor internal peer-group

Front 4

True/False: One limitation of BGP Peer Groups is that they have to share the same outbound routing policies?

Back 4

True

Front 5

True/False: BGP Templates do not allow inheritence?

Back 5

False

Front 6

What are the two types of BGP Templates?

Back 6

Peer session and Peer policy

Front 7

What are BGP Peer Session templates?

Back 7

Group and apply the configuration of general session commands that are common to all address family and NLRI configuruation modes.

Front 8

What are BGP Peer Policy templates?

Back 8

Group and apply the configuration of commands that are specific to address-families and NLRI configuration modes.

Front 9

What are the six BGP neighbor states?

Back 9

Idle, Connect, Active, OpenSent, OpenConfirm, Established

Front 10

What does the BGP neighbor state Idle mean?

Back 10

BGP refuses all incoming BGP connections.

Front 11

What does the BGP neighbor state Connect mean?

Back 11

The router is waiting for a successful TCP negotiation with peer.

Front 12

What does the BGP neighbor state Active mean?

Back 12

The router is unable to establish a successful TCP session.

Front 13

What does the BGP neighbor state OpenSent mean?

Back 13

The router sent and Open message and is waiting for an open message from peer.

Front 14

What does the BGP neighbor state OpenConfirm mean?

Back 14

The router is listening for a keepalive message.

Front 15

What does the BGP neighbor state Established mean?

Back 15

Update messages are sent and routers synchronize.

Front 16

What does the BGP command 'neighbor 1.1.1.1 timers 5 15' do?

Back 16

Sends keepalives every 5 seconds to neighbor 1.1.1.1 and considers the peer dead if it doesn't receive a keepalive within 15 seconds.

Front 17

What is the default BGP keepalive and holdtime timers?

Back 17

60 and 180 seconds.

Front 18

What is the BGP ASN private range?

Back 18

64,512 through 65,535

Front 19

What are the BGP ASN global range?

Back 19

1 through 64,511

Front 20

If you need to remove a BGP private ASN from a neighbors prefix AS Path...how do you do it for neighbor 1.1.1.1?

Back 20

(config-router)neighbor 1.1.1.1 remove-private-as

Front 21

How big is the BGP ASN?

Back 21

2 bytes (16 bits)

Front 22

What are the two new BPG attributes to support 4-byte BGP ASN?

Back 22

AS4_Aggregator and AS4_Path

Front 23

What are the order of BGP path selection attributes?

Back 23

Weight, Local Preference, Locally Originated Routes, AS Path, Origin Type, MED, Paths, Router ID

Front 24

True/False: BGP weight preference is locally significant and does not transfer to other routers?

Back 24

True

Front 25

True/False: The lower the BGP weight is more preferred?

Back 25

False, the higher weight is preferred.

Front 26

True/False: BGP local preference is locally significant and does not transfer to other routers?

Back 26

False

Front 27

True/False: The lower the BGP local preference is more preferred?

Back 27

False, the higher the local preference the more preferred the route is.

Front 28

True/False: Locally originated routes via network or redistribute are preferred over aggregate addresses?

Back 28

True

Front 29

True/False: The shortest AS Path is the most preferred?

Back 29

True

Front 30

True/False: The order of preference for origin type is EGP>IGP>Incomplete?

Back 30

False, IGP>EGP>Incomplete

Front 31

True/False: The higher the MED the more preferred the route is?

Back 31

True

Front 32

True/False: External path are more preferred than internal paths?

Back 32

True

Front 33

True/False: The higher the router ID the more preferred the route is?

Back 33

True

Front 34

What does the BGP command 'bgp deterministic-med' do?

Back 34

Ensures the comparison of the MED variable when choosing routes advertised by different peers in the same autonomous system.

Front 35

What does the BGP command 'bgp always-compare-med' do?

Back 35

Ensures the comparison of the MED variable when choosing routes advertised by different peers in different autonomous systems.

Front 36

Which BGP command groups together MED values from the same autonomous system to be used in the comparison with other autonomous systems?

Back 36

bgp-deterministic-med

Front 37

How do you configure routes received from BGP neighbor 1.1.1.1 to have a weight of 10

Back 37

000?,(config-router)neighbor 1.1.1.1 weight 10000

Front 38

True/False: You have to use a route-map to set the local preference for routes received by a BGP neighbor?

Back 38

True

Front 39

How do you configure a local preference to 150 in a route-map?

Back 39

(config-route-map)set local-preference 150

Front 40

How do you apply a route-map named LOCAL_PREF to routes received from a BGP neighbor 1.1.1.1?

Back 40

(config-router)neighbor 1.1.1.1 route-map LOCAL_PREF in

Front 41

True/False: Local preference can be set for both inbound and outbound prefix advertisments to a BGP neighbor?

Back 41

False, only for inbound advertisements.

Front 42

True/False: You have to use a route-map to perform BGP AS prepending for prefixes advertised by a neighbor?

Back 42

True

Front 43

How do you prepend the AS path 200 200 200 in the route-map AS_PATH?

Back 43

(config-route-map)set as-path prepend 200 200 200

Front 44

How do you change the MED value for prefixes advertised out to neighbors in another autonomous system to 10?

Back 44

(config-route-map)set metric 10

Front 45

If you have a route-map named RM_MED that sets the MED value to 10 for all prefixes that a router advertises out...how do you apply that to neighbor 1.1.1.1?

Back 45

(config-router)neighbor 1.1.1.1 route-map RM_MED out

Front 46

True/False: BGP will only use the best path even if there are multiple paths to the same destination?

Back 46

True

Front 47

How do you configure BGP to install two best paths into routing table?

Back 47

(config-router)maximum-paths 2

Front 48

What does it mean if you see the > next to an entry in the 'show ip bgp' table?

Back 48

The path has been selected as best.

Front 49

What does it mean if you see the * next to an entry in the 'show ip bgp' table?

Back 49

The path has been determined to be valid.

Front 50

What does it mean if you see the ? next to an entry in the 'show ip bgp' table?

Back 50

The path has been determined to be incomplete (origin is unknow or was redistributed).'

Front 51

What does it mean if you see the i next to an entry in the 'show ip bgp' table?

Back 51

The path was originated by and IGP then advertised into BGP.

Front 52

What does it mean if you see the e next to an entry in the 'show ip bgp' table?

Back 52

The path was originated by and EGP.

Front 53

What does the BGP command 'neighbor 1.1.1.1 advertise-map ADVERTISE non-exist-map NON_EXIST do?

Back 53

The router will advertise prefixes listed in the ADVERTISE ACL only if the prefixes in the NON_EXIST ACL do not exist.

Front 54

What two options can you perform BGP conditional advertising when using the 'advertise-map' keyword?

Back 54

exist-map and non-exist-map

Front 55

What is the administrative distance assigned to external BGP routes by default?

Back 55

20

Front 56

What is the administrative distance assigned to internal BGP routes by default?

Back 56

200

Front 57

How do you configure a BGP peer with the address of 1.1.1.1 to support Outbound Route Filtering for sending only?

Back 57

(config-router)neighbor 1.1.1.1 capability orf prefix-list send

Front 58

What three keywords are available when enabling BGP outbound route filtering?

Back 58

Send, receive, and both.

Front 59

What is the benefit of enabling BGP outbound route filtering?

Back 59

Takes away the complexity of a router receiving prefixes and cuts down on processing on both peers.

Front 60

True/False: By default...the community attribute is removed from a BGP update before being sent to the neighbor?

Back 60

True

Front 61

How do you enable BGP communities with neighbor 1.1.1.1?

Back 61

(config-router)neighbor 1.1.1.1 send-community

Front 62

What are the default four well-known communities that can be used to mark prefixes in BGP?

Back 62

Internet, Local-as, No-advertise, No-export

Front 63

What does the BGP community Internet do?

Back 63

Tells the neighbor that it can advertise these routes to all neighbors.

Front 64

What does the BGP community Local-as do?

Back 64

Prevents sending routes outside the local AS within the confederations.

Front 65

What does the BGP community No-advertise do?

Back 65

Prevents the advertising of the route to any peer, internal or external.

Front 66

What does the BGP community No-export do?

Back 66

Prevents the route from being advertised to external BGP peers.

Front 67

What are the four ways to set BGP community attribute values?

Back 67

Network command, aggregate address, neighbor command, or redistribution.

Front 68

True/False: You can only have one community added to a prefix?

Back 68

False, you can have more than one.

Front 69

True/False: By default...BGP does not perform load balancing and only selects a single best path?

Back 69

True

Front 70

How do you configure a BGP router to consider the neighbor at 1.1.1.1 as a route reflector client?

Back 70

(config-router)neighbor 1.1.1.1 route-reflector-client

Front 71

What two additonal BGP attributes are used when route reflectors are configured?

Back 71

Originator and Cluster list

Front 72

What happens if a BGP router receives a prefix that lists either its own IP address in the originator or cluster list field?

Back 72

It will consider it a loop and drop the prefix.

Front 73

How do you manually configure a BGP router's route reflector cluster ID to 1.1.1.1?

Back 73

(config-router)bgp cluster-id 1.1.1.1

Front 74

What two new attributes are enabled when you configure BGP confederations?

Back 74

AS_CONFED_SEQ and AS_CONFED_SET

Front 75

True/False: It is best practice to use BGP private ASNs to denote sub-autonomous systems?

Back 75

True

Front 76

If you are wanting to configure a BGP confederation...which ASN is used when using the command 'router bgp' command?

Back 76

The sub-autonomous ASN.

Front 77

How do you configure a BGP router to be part of a confederation with the ASN being 100?

Back 77

(config-router)bgp confederation identifier 100

Front 78

How do you configure a BGP router to recognize ASN's 65001 and 65001 as sub-autonomous systems in the confederation?

Back 78

(config-router)bgp confederation peers 65000 65001

Front 79

What does the following 'show ip bgp' output tell you regarding the path...Network Next Hop Metric LocPrf Weight Path*>13.10.10.0/24 77.56.10.1 0 100 0(65515 65534) 200 i

Back 79

To get to the prefix 130.10.10.0/24 goes through two sub-autonomous systems 65515 and 65534 before going to the AS 200.

Front 80

What happens to routes that you are aggregating with the BGP command 'aggregate-address' when no arguments are used?

Back 80

An aggregate address will be advertised along with all the routes that you are aggregating.

Front 81

What does the BGP command 'aggregate-address 160.0.0.0 255.0.0.0 summary-only' do?

Back 81

Advertises an aggregate address of 160.0.0.0/8 only...no other routes.

Front 82

True/False: When using BGP 'aggregate-address'...the aggregate route loses all the specific AS_PATH information of the individual prefixes?

Back 82

True

Front 83

If you use the command 'show ip bgp' and see a path with the ASNs 300 {200

Back 83

100} i...what does that indicate?,That the route has been aggregated and as-set was used.

Front 84

True/False: If a route that has been aggregated and has its AS_PATH information used flaps...what happens?

Back 84

The aggregate will update and a BGP update will happen.

Front 85

What are the eight types of maps that you can use with BGP?

Back 85

Suppress-Map, Unsuppress-Map, Route-Map, Attribute-Map, Advertise-Map, Inject-Map, Exist-Map, and Non-Exist-Map.

Front 86

What does a BGP suppress-map do?

Back 86

It allows you to suppress one or more component routes from an aggregate route advertisement.

Front 87

How do you configure a BGP suppress-map using a route-map named SUPPRESS_RM while advertising an aggregate route of 160.0.0.0/8?

Back 87

(config-router)aggregate-address 160.0.0.0 255.0.0.0 suppress-map SUPPRESS_RM.

Front 88

What does a BGP suppress-map do?

Back 88

It allows you to unsuppress one or more component routes from an aggregate route advertisement.

Front 89

How do you configure a BGP unsuppress-map using a route-map named UNSUPPRESS_RM while advertising an aggregate route of 160.0.0.0/8?

Back 89

(config-router)aggregate-address 160.0.0.0 255.0.0.0 unsuppress-map UNSUPPRESS_RM.

Front 90

What does a BGP inject-map do?

Back 90

It is used to de-aggregate routes based on the precense of a specific aggregate.

Front 91

What does a BGP advertise-map do?

Back 91

It allows you to specify, via a route-map, to specify where an aggregate route gets its attributes from when using as-set.

Front 92

What does a BGP attribute-map do?

Back 92

It allows you to specify your own attributes that the advertised aggregate will use.

Front 93

What is the purpose of the BGP local-as feature?

Back 93

The local-AS feature is useful if ISP-A purchases ISP-B, but ISP-B's customers do not want to modify any peering arrangements or configurations.

Front 94

How do you configure the BGP local-as as 200 for neighbor 1.1.1.1?

Back 94

(config-router)neighbor 1.1.1.1 local-as 200.

Front 95

True/False: If you configure BGP local-as for a peer...the local ASN will show in the 'show ip bgp' output?

Back 95

False, it will show both the original and new ASN.

Front 96

What does the BGP feature allowas-in do?

Back 96

It will allow an ASN in even if it is the same.

Front 97

What does the command 'neighbor 1.1.1.1 allowas-in 1' do?

Back 97

It allows one instance of the same ASN from neighbor 1.1.1.1.

Front 98

What does the command 'neighbor 1.1.1.1 as-override' do?

Back 98

It will override the BGP peers ASN in the route to the local AS basically overriding the AS_PATH.

Front 99

What does the command 'set as-path prepend 65001 65001 65001' do?

Back 99

It adds 65001 three times to a path.

Front 100

What are the two types of BGP resets that can happen?

Back 100

Soft and hard reset.

Front 101

How do you configure BGP soft reconfiguration for neighbor 1.1.1.1?

Back 101

(config-router)neighbor 1.1.1.1 soft-reconfiguration inbound

Front 102

What does the regex character . match?

Back 102

Matches any single character. For example b.. matches ban, boy, but but not boot.

Front 103

What does the regex character $ match?

Back 103

It matches the end of the line.

Front 104

What does the regex character ^ match?

Back 104

It matches the beginning of the line.

Front 105

What does the regex character * match?

Back 105

Matches zero or more occurences of the character immediately preceding.

Front 106

What does the regex character + match?

Back 106

Matches one or more occurences of the character or regular expression immediately preceding.

Front 107

What does the regex character ? match?

Back 107

Matches zero or one occurence of the character or regular expression immediately preceding.

Front 108

True/False: Prefix-independent Convergence (PIC) requires Bidirectional Forwarding to be enabled?

Back 108

True

Front 109

True/False: Prefix-independent Convergence (PIC) is only supported on IP?

Back 109

False, IP and MPLS.

Front 110

Where does Prefix-independent Convergence (PIC) store backup/alternate path information?

Back 110

Routing Information Base (RIB), Forwarding Information Base (FIB), and Cisco Express Forwarding (CEF).

Front 111

How do you configure BGP to calculate a backup/alternate path and install it into the RIB and CEF?

Back 111

(config-router)bgp additional-paths install

Front 112

True/False: BGP additional paths path ID can apply to any address family?

Back 112

True

Front 113

How do you configure BGP to notify the neighbor 1.1.1.1 that it can send addition path information?

Back 113

(config-router)bgp 1.1.1.1 additional-paths send.

Front 114

How do you configure BGP to notify neighbors that it can send and receive additional paths inside an address family?

Back 114

(config-router-af)bgp additional-paths send receive

Front 115

What are the three BGP additional path selection policies?

Back 115

best 2 or best 3, group-best, or all.

Front 116

How do you configure BGP to select the group-best policy for additional paths?

Back 116

(config-router-af)bgp additional-paths select group-best all

Front 117

How do you configure BGP to advertise the best 3 additional paths to neighbor 1.1.1.1 in an address family?

Back 117

(config-router-af)neighbor 1.1.1.1 advertise additional-paths best 3

Front 118

True/False: You can use route-maps to tag paths that can be used in the BGP additional path selection process?

Back 118

True

Front 119

True/False: BGP next-hop addressing tracking is event driven?

Back 119

True

Front 120

What is the default BGP RIB scan time?

Back 120

60 seconds.

Front 121

What is the default BGP hold-time?

Back 121

180 seconds.

Front 122

How do you configure BGP to use the route-map named TEST to selectively define route to help resolve the BGP next hop?

Back 122

(config-router)bgp nexthop route-map TEST.

Front 123

How do you configure BGP to use fast session deactivation for neighbor 1.1.1.1?

Back 123

(config-router)neighbor 1.1.1.1 fall-over

Front 124

How do you disable BGP next-hop address tracking?

Back 124

(config-router)no bgp nexthop trigger enable

Front 125

How do you configure BGP next-hop tracking to occur every 20 seconds?

Back 125

(config-router)bgp nexthop trigger delay 20

Front 126

What BGP feature monitors the RIB and if a route to a peer is not present in the routing table...it will immediately deactiveate the peer session without waiting for the hold down timer?

Back 126

fall-over

Front 127

True/False: BGP dynamic neighbors is supported in both IPv4 and IPv6?

Back 127

False

Front 128

True/False: BGP dynamic neighbors uses peer groups?

Back 128

True

Front 129

How do you configure BGP dynamic neighbors to limit the number of neighbors supported to 100?

Back 129

(config-router)bgp listen limit 100

Front 130

How do you configure BGP dynamic neighbors to listen only to the 192.168.0.0/16 range for peer group Group192?

Back 130

(config-router)bgp listen range 192.168.0.0/16 peer-group Group192

Front 131

What is the purpose of the BGP 'address-family ipv4' command?

Back 131

To declare neighbors whom we want to exchange normal IPv4 unicast traffic but may not support multiprotocol-capable.

Front 132

How do you configure BGP to automatically display the 'address-family ipv4' section and put IPv4 unicast configurations in that section?

Back 132

(config-router)bgp upgrade-cli

Front 133

What BGP address family should you use if you are sending packets that need to be labeled via MPLS?

Back 133

VPNV4