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ENARSI > Things to Remember > Flashcards

Things to Remember Flashcards

1
Q

Which OSPF network types do not require a DR/BDR?

A
  • Point-to-point
  • Point-to-multipoint
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2
Q

EIGRP Summarization Commands

  • Classic mode
  • Named mode
  • Route to NULL0 installed?
A
  • on the interface “ip summary-address eigrp 4 172.16.0.0 255.255.0.0
  • under AF-Interface “summary-address 172.16.0.0/16
  • Yes
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3
Q

Regarding BFD:

  • what does BFD stand for?
  • what does it require in order to operate?
  • how does it work?
  • which 2 places is it enabled?
A
  • Bidirectional Forwarding Detection
  • CEF
  • Sends small fixed-length keepalive packets detecting failures in less than a second
  • it is enabled on the interfaces and under the routing protocol
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4
Q

OSPF Summarization Commands:

  • for ABR
  • NULL0 route auto-installed?
  • for ASBR
  • NULL0 route auto-installed?
A
  • area 0 range 172.16.0.0 255.255.0.0
  • yes
  • summary-address 172.16.0.0 255.255.0.0
  • yes with metric of 254
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5
Q

BGP Summarization Commands:

  • Route to NULL0 auto-installed?
A
  • aggregate-address 172.16.0.0 255.255.0.0 summary-only as-set
  • yes
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6
Q

Regarding uRPF:

  • what does uRPF stand for
  • what does it do
  • what does it require
  • what modes does it operate in
A
  • Unicast Reverse Path Forwarding
  • it compares the source address of a packet and checks to see if the packet came in the same interface the router would use to get to the source
  • CEF
  • Strict, Loose, and VRF
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7
Q

In OSPF, for each of the following stub area types list 1) which LSA type is not allowed by any stub network types; 2) which stub areas allow ASBRs; and 3) what is not allowed by the ‘Totally’ stub types?

A
  • None of the Stub network types allow Type 5 LSAs so they all need a default route (the NSSA is the only type that needs it manually installed)
  • ASBRs are only allowed in NSSA and Totally NSSA
  • Both ‘Totally’ types don’t allow LSAs 3 and 5
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8
Q

What protocol numbers are used by the following:

  • OSPF
  • EIGRP
  • BGP
A
  • IP 89
  • IP 88
  • TCP 179
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9
Q

What multicast addresses do the following use:

  • EIGRP
  • OSPF
A
  • EIGRP - 224.0.0.10
  • OSPF - 224.0.0.5 and 224.0.0.6
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10
Q

In EIGRP, which show command would display authentication parameters such as authentication mode and keychain being used?

A

“show ip eigrp interfaces detail”

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11
Q

What is the source and destination of:

  • EIGRPv6 Hello Messages?
  • EIGRPv6 Update Messages?
A
  • Hello’s are sourced from Link Local address FE80::/10 and destined for FF02::A
  • Update messages are sourced and destined for link local addresses
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12
Q

In OSPF, which state do routers send LSRs and LSUs to each other?

A

Loading

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13
Q

In OSPF, which area types do not permit ASBRs?

A
  • Stub
  • Totally Stubby
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14
Q

In OSPF, what show command displays the timers configured on an interface?

A

“show ip ospf interface”

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15
Q

In OSPF, can neighbors with different network types form a full neighborship?

A

Yes, as long as the timers match

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16
Q

In OSPF, what do the following option bits mean:

  • E-bit
  • DC-bit
  • N-bit
  • MC-bit
  • V6-bit
  • R-bit
A
  • E-bit - capable of processing external LSAs
  • DC-bit - capable of suppressing future Hellos
  • N-bit - supports Type 7 LSAs
  • MC-bit - supports Multicast
  • V6-bit - router is participating in IPV6 routing
  • R-bit - router actively participates in forwarding traffic
17
Q

In OSPFv3, which ‘show’ command will display whether the area is participating in authentication?

A

“show ospfv3”

18
Q

In OSPFv3, which ‘show’ command will display the reference bandwidth?

A

“show ipv6 ospf”

19
Q

In OSPFv3, which command will display whether the local router has injected a default route?

A

“show ospfv3”

20
Q

In EIGRP Named Mode, what command enables EIGRP on an interface?

A

“network” command

21
Q

In EIGRP, by default, what is the maximum amount of bandwidth that EIGRP is allowed to use on a link?

A

50%

22
Q

In classic EIGRP, where do you modify the Hello and Hold timers/

A

On the interface.

23
Q

In EIGRPv6, what show command can you use to determine if a remote router is a stub router?

A

“show ipv6 eigrp neighbors detail”

24
Q

In OSPFv3, which 2 show commands display whether a router is an ABR?

A
  • “show ipv6 ospf”
  • “show ipv6 protocols”
25
Q

In BGP, which ‘show’ command can verify the incoming and outgoing TTL values?

A

“show bgp ipv4 unicast neighbors”

26
Q

When using a route-map for redistribution, there are 3 conditions that can be used to match prefixes. What are they?

A
  • Route type
  • Outbound interface
  • Prefix List
27
Q

In EIGRP for IPV4, which 2 ‘show’ commands can you use to determine the value of K-6?

A
  • “show ip protocols”
  • “show eigrp protocols”
28
Q

In OSPF, how is the cost of a link calculated?

A

Reference bandwidth of 100 Mbps / Interface bandwidth

The assumption was that reference bandwidth would always be greater than interface bandwidth. Today it’s not.

29
Q

What are the 4 well-known communities and what do they mean?

A
  • Internet - advertise the prefix to all BGP neighbors
  • No-advertise - don’t advertise the prefix to any BGP neighbors
  • No-export - don’t advertise the prefix to any eBGP neighbors (other ASs)
  • Local-as - don’t advertise the prefix outside the confederation
30
Q

When redistributing from BGP into OSPF what kind of routes will be redistributed?

A

Only eBGP routes.

31
Q

Which OSPF network types set the Hello timer to 30 sec?

A
  • Non-broadcast
  • Point-to-multipoint
32
Q

In OSPFv3 which instance numbers are valid for IPv6 and which are valid for IPV4?

A
  • IPV6 - 0 to 31
  • IPV4 - 64 to 95
33
Q

In LFA FRR, What are the 8 tie-breakers?

A
  • 0 post-convergence
  • 10 primary-path
  • 20 interface-disjoint
  • 30 lowest-metric
  • 40 linecard-disjoint
  • 50 broadcast-interface-disjoint
  • 256 load-sharing
34
Q

What authentication types do each of the following routing protocols support?

  • EIGRP
  • OSPF
  • OSPFv3
  • BGP
A
  • EIGRP
    • MD5
    • SHA-2 (named mode)
  • OSPF
    • Plain text
    • MD5
    • HMAC SHA
  • OSPFv3
    • IPsec with AH or ESP
  • BGP
    • MD5
35
Q

What is the default reference bandwidth for OSPF

A

100 Mbps

36
Q

What is EIGRPs retry limit when trying to communicate with a router that is not responding?

A

The retry limit is 16

37
Q

In OSPFv3, if instance numbers are not provided what values do they default to?

A
  • IPv6 defaults to 0
  • IPv4 defaults to 64

ENARSI (6 decks)

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