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CCNA2 Flashcards

1
Q

RAM to store

A 
IOS (copied to RAM during bootup)
Running config
Routing table
ARP cache
Packet buffer
(IRRAP - Please Ask Indian Red Rabbit)
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2
Q

ROM to store

A

Bootstrap
Diagnostic software
Scaled-down version of IOS

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3
Q

Flash

A

Permanent storage for IOS

Can be upgraded

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4
Q

Default value of configuration register

A

0x2102

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5
Q

Command to show routing table on PC

A

route print

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6
Q

Metrics for dynamic routing protocols

A

Hop count, bandwidth, load, delay, reilability, cost
HBLDRC - Hello Baby, Let Dady Remove Caca
RIP: Hop count
OSPF: Bandwidth
EIGRP: combination of bandwidth and delay

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7
Q

Which routing protocol supports unequal cost load balancing

A

only EIGRP

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8
Q

Show command for CDP

A

show cdp neighbors [detail]

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9
Q

Command to disable CDP

A

(config)#no cdp run

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10
Q

Command to stop CDP advertisement on a interface

A

(config-if)# no cdp enable

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11
Q

To configure static route between Ethernet interfaces

A

always using exit interface together with next hop ip address

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12
Q

Distance vector routing protocols

A

RIP, EIGRP

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13
Q

AD of Connected, Static, EIGRP summary, Internal EIGRP, OSPF, RIP

A

0,1,5,90,110,120

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14
Q

RIP routing updates interval

A

30s

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15
Q

EIGRP

A

cisco proprietary
support unequal cost load balancing
uses DUAL
no peirodic updates, only update if thiere is a change, bounded update

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16
Q

RIP timers

A

Invalid 180s
Flush 240s
Holddown 180s

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17
Q

Radom Jitter

A

Collison caused by multiple route updates trasmited at the same time
RIP_JITTER: 0% to 15% of the interval.

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18
Q

Maximum metric in RIP

A

15 hops

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19
Q

Load balancing on RIPv1

A

Default load balancing is 4 equal cost paths, can support up to six paths.

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20
Q

Routes update addresses used by RIP

A

RIPv1 uses broadcast addresses, RIPv2 uses multicast addresses

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21
Q

Which routing protocol runs only on CISCO routers

A

EIGRP

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22
Q

EIGRP uses what to maintain all the routes received from neighbors

A

Use a Topology table

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23
Q

EIGRP uses what to establish adjacencies with neighboring routers

A

using hello protocol

24
Q

EIGRP metric is based on

A

based on minimum bandwidth and cumulative delay of the path

25
EIGRP has fast convergence due to
DUAL calculation
26
EIGRP supports multiple network layer protocols such as
IP, IPX and AppleTalk
27
Class A IP addresses
Class A: 1.0.0.0 to 126.255.255.255
28
Class B IP addresses
Class B: 128.0.0.0 to 191.255.255.255
29
Class C IP addresses
Class C: 192.0.0.0 to 223.255.255.255
30
Configure RIPv1
``` #router rip (config-router)#network 192.168.4.0 (config-router)#network 192.168.5.0 (config-router)#passive-interface f0/0 (config-router)#default-information originate ```
31
Enhancements of RIPv2 to RIPv1
Next-hop addresses included in the routing updates Use of multicast addresses in sending updates Authentication option available
32
Two extensions are added in RIPv2 message:
1. Subnet mask field | 2. Next Hop address
33
Why use Null Interfaces
a static route must have an active exit interface before it will be installed in the routing table. Using the null interface will allow R2 to advertise the static route in RIP even though networks belonging to the summary 192.168.0.0/16 do not actually exist.
34
Command to configure Null Interfaces
R2(config)#ip route 192.168.0.0 255.255.0.0 Null0
35
RIPv2 command to populate static route
R2(config-router)#redistribute static
36
Command to enable RIPv2
(config)#router rip | (config-router)#version 2
37
Disable auto-summary on RIPv2
(config-router)#no auto-summary
38
What is A level 1 route
A level 1 route is a route with a subnet mask equal to or less than the classful mask of the network address
39
A level 1 route can function as:
Default route, supernet route, network route
40
What is an ultimate route
An ultimate route is a route that includes: either a next-hop IP address (another path) and/or an exit interface
41
What is A level 1 parent route
A level 1 parent route is a network route that does not contain a next-hop IP address or exit interface for any network. Ex: 172.16.0.0/24 is subnetted, 1 subnets
42
What is A level 2 route
A level 2 route is a route that is a subnet of a classful network address. C 172.16.3.0 is directly connected, FastEthernet0/0
43
Classful and classless routing behavior
Classful: (config)#no ip classless Classless: (config)#ip classless
44
Purpose of Classful and classless routing behaviors
Classful and classless routing behaviors determine how the routing table is searched after it is populated.
45
EIGRP updates MAC address and IP address
Multicast, MAC: 01-00-5E-00-00-0A | IP: 224.0.0.10
46
EIGRP Packet Types
5 types: Hello | Update | Ack | Query | Reply
47
EIGRP Hello packets interval
5s on most networks, but 60s on NBMA such as Frame Relay, X.25 and ATM
48
EIGRP holdtime interval
3 times of the hello interval, which means 15s on most networks, and 180s on NBMA networks.
49
When will EIGRP ack packet be sent
When reliable delivery is used, ack packet always sent as unicst.
50
Which routing protocols can be configured to encrypt and authenticate their routing information?
RIPv2, EIGRP, OSPF, IS-IS, and BGP
51
What is the protocol used by EIGRP for the delivery and reception of EIGRP packets
Reliable Transport Protocol (RTP)
52
In order to establish neighbor adjacencies, EIGRP requires all routers in the same routing domain to be configured with the same...
process ID
53
EIGRP automatically includes a null0 summary route as a child route whenever both of following conditions exist:
There is at least one subnet that was learned via EIGRP. | Automatic summarization is enabled.
54
The default K values can be changed with the EIGRP router command:
Router(config-router)#metric weights tos k1 k2 k3 k4 k5
55
To verify k values
#show ip protocols

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