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Cisco CCNA 2 > 20 - Implementing HSRP for First Hop Routing > Flashcards

20 - Implementing HSRP for First Hop Routing Flashcards

1
Q

What are 3 types of First Hop Redundancy Protocols (FHRP)?

A

HSRP, VRRP, and GLBP

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2
Q

In addition to the minimum single command needed to implement HSRP, what other commands can be used?

A

* standby ver 2 * standby 1 ip 10.1.1.1 * standby 1 priority 110 * standby 1 name whatever

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3
Q

What is the default priority in HSRP?

A

100

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4
Q

In HSRP if the two routers are brought up at the same time who wins the election as active router?

A

The router with the highest priority

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5
Q

What ‘show’ cmd tells you which router is active?

A

show standby brief’

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6
Q

What does ‘standby preempt’ do?

A

If an HSRP router comes up and finds another HSRP router that is active it checks priority. If it 1) has a higher priority and 2) is configured with ‘standby preempt’ it will take over the active role

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7
Q

What are the two versions of HSRP?

A

version 1 and version 2

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8
Q

Do two routers in an HSRP group have to run the same version?

A

yes.

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9
Q

What will happen if two HSRP routers are using two different HSRP versions?

A

They won’t recognize each other.

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10
Q

What are the 6 differences between HSRP version 1 and version 2?

A
  • ver 2 supports IPv6
  • ver 2 supports faster Hello timer
  • ver 2 supports up to 4095 group numbers
  • ver 2 configures its vmac address differently
  • ver 2 uses different multicast address
  • ver 2 supports unique identifier for each HSRP router
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11
Q

What is the difference between HSRP ver 1 vmac and ver 2 vmac?

A

ver 1 vmac the last two hex digits are variable, ver 2 the last 3 hex digits are variable

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12
Q

What version of HSRP uses a vmac address of 0000.0C07.Acxx ?

A

version 1

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13
Q

What version of HSRP uses a vmac address of 0000.0C9F.Fxxx ?

A

version 2

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14
Q

For 2 routers in an HSRP group, what config parameters must match?

A
  • version number
  • same standby group #
  • same virtual IP
  • virtual IP must be in same subnet as IP address
  • same VLAN
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15
Q

In addition to checking the parameters that must match what other troubleshooting steps should you do?

A
  • make sure no ACL is filtering UDP port 1985
  • ver 1 sends to 224.0.0.2
  • ver 2 sends to 224.0.0.102
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16
Q

What would happen if the 2 HSRP routers had different virtual Ips configured?

A

* HSRP would not go active * virtual IP changes based on whichever router is active

17
Q

What would happen if the 2 HSRP routers were using different versions?

A

They would become active but a duplicate IP address would be detected

18
Q

What would happen if the 2 HSRP routers had a group mismatch?

A

They would become active but a duplicate IP address would be detected

19
Q

HSRP, at a minimum, needs only a single command to work. What is that command?

A

standby 1 ip 172.21.2.1

20
Q

What 7 items are shown by ‘show standby brief”

A
  • Interface
  • Group
  • Priority
  • State
  • Active
  • Standby
  • Virtual IP
21
Q

What are HSRP default Hello and Hold timers?

A
  • Hello is 3 sec
  • Hold is 10 sec
22
Q

What are the rules that determine which HSRP point is active?

A
  • if the local router doesn’t see any other HSRP routers it becomes active
  • Whichever router has the highest priority wins the election
  • If a router comes up, sees and already active HSRP even if the other router has higher priority it will go into standy unless….
    • the local router is configured to Preempt
23
Q

What ‘show’ command should allow you to back-engineer the HSRP configuration?

A

show standby

24
Q

What commands are used to track the line protocol of an interface?

A
  • track 1 interface Serial0/0/0 line-protocol

Then in HSRP config add:

  • int gig0/0
    • standby 1 track 1 decrement 50
25
Q

What are the 6 states that HSRP can be in?

A
  • Init - first starting
  • Learn - no virtual IP address, no Hellos
  • Listen - knows virtual IP, no Hellos but listening for them
  • Speak - Has virtual IP, participates in election, is sending Hellos
  • Standby - Not the active HSRP point
  • Active - Is the Active HSRP router

Cisco CCNA 2 (40 decks)

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