Ccna 640-801 Difficult Questions

Front 1

which Network Control Protocol (NCP) does PPP use to encapsulate IP traffic?

Back 1

IPCP (IP Network Control Protocol)

Front 2

Which techniques allow switches to identify which VLAN each frame orginated from?

Back 2

ISL encapsulation and 802.1Q tagging.

Front 3

where is the shared memory located on a router?

Back 3

Dynamic RAM (DRAM)

Front 4

can full-duplex ethernet be used on a connection that connects a hub to a switch?

Back 4

NO

Front 5

the show interface command describes the funation a;lit of which layer ion the osi mopdel?

Back 5

latyer 2

Front 6

which command is used to delete entires from teh mac address tanle?

Back 6

clear mac-address-table

Front 7

which TCP/IP model layer corresponeds to the OSi model layer 2

Back 7

network access

Front 8

how many subnets does a class B network that uises subnet mask 255.255.255.0 support?

Back 8

254

Front 9

which command defines IGRP as teh routing protocol

Back 9

#router igrp

Front 10

which command is used to view the summary status of tinterfaces condfifgures f or ipo

Back 10

#show ip interface briwf

Front 11

which command is used to configure OSPF process?

Back 11

router ospf [process id]

Front 12

which technology uses analog signaling and is not capable of sending data beyond 9600 bits per second?

Back 12

PSTN
public switched telephone network

Front 13

term used to describe intermittent interface or link failures?

Back 13

flapping

Front 14

what does VTP do and stand for?

Back 14

Vlan trunking protocol (vtp) you only have to add, delete or rename vlans on the server VTP switch and the info is passed to the other switches.

Front 15

command to enter the description to multiple interfaces at once.

Back 15

#interface range fastethernet 0/1-14

Front 16

what cisco switch allows both routing and swiching

Back 16

3350 switch

Front 17

max data transfer ate of 802.11b

Back 17

11mbs

Front 18

can a routers own access-list block it from sending packets out its own interface?

Back 18

no. acls do not apply to its own interfaces more specifically traffic orginating in the router.

Front 19

a network is slow, what kind of packets tell the users router that it is Receiving packets from a congested network?

Back 19

FECN (forward explicit congestion control)

Front 20

whats should the config registry be set to after you complete password recovery process

Back 20

0x2102

Front 21

which command modifies the config registry to bypass NVRAM and boot from flash memomory when issued at the >prompt

Back 21

o/r 0x2142

Front 22

comand to change AD of RIP to 90

Back 22

#distance 90

Front 23

name 3 wan protocols typically iused for leased lines

Back 23

ppp, hdlc, slip
[slip is serial line internet protcol].

Front 24

in which VTP mode are VLAN configuratons not stored in NVRAM?

Back 24

client

Front 25

which error dection protocol can cisco routers use to avoid PPP frame looping?

Back 25

magic number

Front 26

which router memory stores a bootable IOS image which is not typically used?

Back 26

ROM

Front 27

which protocol data units PDUs are used fro the exchange of data between the transport layers of the transmitting and receiving systems in an TCP/ip ethernetwork?

Back 27

TCP segments

Front 28

which ppp authenication protocol preforms a two-way hand shake?

Back 28

PAP (password authentication protocol)

Front 29

command when used cause the router to log messages for each IGRP packet

Back 29

#debug ip igrp events

Front 30

during password recovery what must the config reg be set to inorder to iginore the passwords stored in NVRAM

Back 30

0x2142

Front 31

osi layer that provides coding and conversion functions

Back 31

presentation

Front 32

which keyword at the end of an ACL entry show whether the ACL number if it was permited, or denied and port specific info?

Back 32

log

Front 33

ISL encapsulation is used to?

Back 33

tag frames with VLAN number to help id what frame is from what VLAN.

Front 34

which routing alogorithm adjusts to changing network conditions by analyzing incoming routing updates?

Back 34

Dynamic

Front 35

what would be the AD in a situation where the router does not beileve the source of the route and doesnt install the route in its routing table?

Back 35

255

Front 36

command to config igrp routing on a router with the AS #of 100

Back 36

router igrp 100
100 is the AS number

Front 37

command to view the status of spanning tree on a switch?

Back 37

#show spanning-tree

Front 38

command to config secure MAC addresses on a switch?

Back 38

#switchport port-security mac-address [mac-address] [interface]

Front 39

command that ensures the first file from flash memory is loaded?

Back 39

#boot system flash

Front 40

which three WAN encapsulation protocols are typically used for packedt-switched WAN connections?

Back 40

X.25, frame-relay and ATM.

Front 41

what are the five states of STP?

Back 41

Blocking-receives bpdu's
listening-receives bpdu's, learning is disabled here.
learning-adds to database, receives processes
forwarding-
disabled-receives and responds to nmm and receives bpdus.

Front 42

to enable STP on vlan 2 on a new switch what needs to be done?

Back 42

nothing. STP{ is enabled by default.

Front 43

What bridge is selected as teh root bridge?

Back 43

bridge with the lowest (BRIDGE ID)

Front 44

what makes up the (Bridge Identifier) Bridge ID?

Back 44

the bridge priority plus the MAC address of the bridge. Two-bytes priority and six-byte MACa address.

Front 45

a single root bridge is eleced per broadcats domain?

Back 45

True.

Front 46

the command #show cdp neighbors detail, will display what about the remote router?

Back 46

ip address
platform
hostname

Front 47

what does the command
#debug ip packet 101 detail.... do?

Back 47

enables the debug process for access list 101. shows u each ACL decision that the router has to make and it outcome.

Front 48

config registry setting to ignore NVRAM and boot from flash?

Back 48

0x2142

Front 49

config registry to bypass NVRAM and boot from ROM.

Back 49

0x2102

Front 50

maintains table for each routed protocol it supports? What dynamic protocol is it?

Back 50

eigrp

Front 51

two commands to config chap on an interface?

Back 51

#ppp authentication chap
#username [remote_router] password [password]

Front 52

eigrp max number of hops?
composite metric is ___ bits?

Back 52

- 224 hops
- 32bits or 4 bytes

Front 53

command to config the "learning" time for spepific spanning-tree instances?

Back 53

#spanning-tree learn-time

Front 54

method which a group of contigiuos subnets are rolled up into one routing entry?

Back 54

route summerization

Front 55

command used to statically configure the interface into VLAN 20.

Back 55

#switchport access vlan 20

Front 56

vlan trunking protocol encapsulates ethernet frames

Back 56

ISL

Front 57

ios command to gather info about a router image file, such as the name of the system image file.

Back 57

show flash

Front 58

vtp operation. what must switches share to share VLAN info?

Back 58

-same domain name and password.
-active trunk link between them

Front 59

what routing protocol converages the fastest?

Back 59

eigrp

Front 60

ISL and dot1Q.
which is proprietary and what do they stand for?

Back 60

InterSwitch Link, proprietary.
802.1q industry standard.

Front 61

what mode will the following boot-into.
0x2142
0x2120
0x2101
0x2102

Back 61

0x2142-boot normally ab bypass loading the config.
0x2120-boot into ROM Monitor mode.
0x2101-boot into bootstrap.
0x2102-boot ios from flash and config from nvram (normal).

Front 62

command to change configuration registry?
change it from ROM monitor?

Back 62

#config-register [0x2142]
#confreg [0x2101

Front 63

#erase startup-config.... will remove all configs except ______ and what command must be entered to remove the final config?

Back 63

-vlans
-delete flash:vlan.dat

Front 64

if a main interface is enabled are the subintertfaces automatically enabled?

Back 64

yes

Front 65

how to config a OSPF router id?

Back 65

two ways.
1. create a loopback addy.
2. #router-id ospf [number]
#2 will override.

Front 66

which ICMP message type is used by "ping" command to verify connectivity?

Back 66

Echo

Front 67

command to config port security on a switch?

Back 67

#switchport port-security

Front 68

network control protocol (NCP) that PPP uses to encapsulate CDP traffic?

Back 68

CDPCP (CDP Network Control Protocol)

Front 69

ACLs that allow IP packets to be filtered based on upper-layer *session* information?

Back 69

Reflexive ACLs

Front 70

command that verifies IOS verision running on router and available system memory?

Back 70

show version

Front 71

process that a router follows when it advertisies a network as unreachable to the interface from which the update whas received?

Back 71

Poision-reverse