CCIE Routing and Switching Written Exam
Exam Number 400-101 CCIE
Associated Certifications CCIE Routing and
Switching
Duration 120 Minutes (90 - 110 questions)
Available Languages
English
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Exam Tutorial Review type of exam questions
NO.1 Assume that the following MAC addresses are used for the bridge ID MAC
address by four
different switches in a network. Which switch will be elected
as the spanning-tree root bridge?
A. SwitchA uses MAC
1000.AA-AA-AA-AA-AA-AA.
B. SwitchB uses MAC 2000.BB-BB-BB-BB-BB-BB.
C.
SwitchC uses MAC 3000.CC-CC-CC-CC-CC-CC.
D. SwitchD uses MAC
4000.DD-DD-DD-DD-DD-DD.
Answer: A
Cisco
Vorbereitung 400-101
testking 400-101Explanation:
The switch with
the highest switch priority (the lowest numerical priority value) is elected as
the root
switch. If all switches are configured with the default priority
(32768), the switch with the lowest
MAC address in the VLAN becomes the root
switch.
Reference.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/122_53_se/con
figuration/guide/2960scg/swstp.html
NO.2
Which two statements about reverse ARP are true? (Choose two.)
A. Its servers
require static mappings.
B. It works with AutoInstall to configure new
devices.
C. It provides IP addresses for subnet masks.
D. It provides IP
addresses for default gateways.
E. It requires less maintenance than
DHCP.
Answer: A,B
Cisco 400-101
prüfungsvorbereitung 400-101NO.3 Which term
describes an EIGRP route that has feasible successors?
A. active
B.
passive
C. redistributed
D. invalid
Answer: B
Cisco
quizfragen und antworten 400-101
Antworten 400-101 Fragenkatalog 400-101
prüfungsvorbereitung 400-101 400-101
prüfungsfrageExplanation:
A topology table entry for a destination
can have one of two states. A route is considered in the
Passive state when a
router is not performing a route recomputation. The route is in Active
state
when a router is undergoing a route recomputation. If there are always
feasible successors, a route
never has to go into Active state and avoids a
route recomputation.
When there are no feasible successors, a route goes into
Active state and a route recomputation
occurs. A route recomputation
commences with a router sending a query packet to all neighbors.
Neighboring
routers can either reply if they have feasible successors for the destination or
optionally
return a query indicating that they are performing a route
recomputation. While in Active state, a
router cannot change the next-hop
neighbor it is using to forward packets. Once all replies are
received for a
given query, the destination can transition to Passive state and a new successor
can be
selected.
Reference.
http://docwiki.cisco.com/wiki/Enhanced_Interior_Gateway_Routing_Protocol
NO.4
Refer to the exhibit.
Which two corrective actions could you take if EIGRP
routes from R2 fail to reach R1? (Choose two.)
A. Configure R2 to use a VRF
to send routes to R1.
B. Configure the autonomous system in the EIGRP
configuration of R1.
C. Correct the network statement on R2.
D. Add the
interface on R1 that is connected to R2 into a VRF.
Answer: B,D
Cisco echte
Fragen 400-101 400-101
antworten 400-101 Prüfungsfrage 400-101
zertifizierungsantwortenExplanation:
In this question we are
running VRF Lite on R1. VRF Lite is also knows as "VRF without running
MPLS".
This is an example of how to configure VRF Lite with EIGRP:
ip vrf
FIRST rd 1:1 ! ip vrf SECOND rd 1:2 ! router eigrp 1 no auto-summary !
address-family ipv4 vrf
FIRST network 10.1.1.1 0.0.0.0 no auto-summary
autonomous-system 200 exit-address-family !
address-family ipv4 vrf SECOND
network 10.1.2.1 0.0.0.0 no auto-summary autonomous-system
100
exit-address-family ! interface FastEthernet0/0 ip vrf forwarding FIRST
ip address 10.1.1.1
255.255.255.0 ! interface FastEthernet0/1 ip vrf
forwarding SECOND ip address 10.1.2.1
255.255.255.0
The above example
creates two VRFs (named "FIRST" and "SECOND"). VRF "FIRST" runs on EIGRP
AS
200 while VRF "SECOND" runs on EIGRP AS 100. After that we have to add
interfaces to the
appropriate VRFs. From this example, back to our question
we can see that R1 is missing the
"autonomous-system ..." command under
"address-family ipv4 vrf R2. And R1 needs an interface
configured under that
VRF. Note. R2 does not run VRF at all! Usually R2 resides on customer
side.
NO.5 Which option is the default maximum age of the MAC address
table?
A. 300 seconds
B. 500 seconds
C. 1200 seconds
D. 3600
seconds
Answer: A
Cisco
Zertifizierungsfragen 400-101 originale
fragen 400-101Explanation:
To configure the
maximum aging time for entries in the Layer 2 table, use the
mac-address-table
aging-time command in global configuration mode.
Syntax
Description
seconds
MAC address table entry maximum age. Valid values are
0, and from 5 to 1000000 seconds. Aging
time is counted from the last time
that the switch detected the MAC address. The default value is
300
seconds.
Reference.
http://www.cisco.com/c/en/us/td/docs/ios/lanswitch/command/reference/lsw_book/lsw_m1.html
NO.6
Refer to the exhibit.
A spoke site that is connected to Router-A cannot reach
a spoke site that is connected to Router-B,
but both spoke sites can reach
the hub. What is the likely cause of this issue?
A. There is a router doing
PAT at site B.
B. There is a router doing PAT at site A.
C. NHRP is
learning the IP address of the remote spoke site as a /32 address rather than a
/24
address.
D. There is a routing issue, as NHRP registration is
working.
Answer: B
Cisco prüfungen 400-101 echte
fragen 400-101
Antworten 400-101Explanation:
If one spoke is
behind one NAT device and another different spoke is behind another NAT device,
and
Peer Address Translation (PAT) is the type of NAT used on both NAT
devices, then a session initiated
between the two spokes cannot be
established.
Reference.
http://www.cisco.com/c/en/us/td/docs/ios/ios_xe/sec_secure_connectivity/configuration/guide/co
nv
ert/sec_dmvpn_xe_3s_book/sec_dmvpn_dt_spokes_b_nat_xe.html
NO.7 Which TCP
feature allows a client to request a specific packet that was lost?
A. flow
control
B. sliding window
C. fast recovery
D. selective
acknowledgment
Answer: D
Cisco
Prüfungsunterlagen 400-101
Zertifizierungsantworten 400-101
Fragenkatalog 400-101
zertifizierungExplanation:
The TCP Selective Acknowledgment
feature improves performance if multiple packets are lost from
one TCP window
of data. Prior to this feature, because of limited information available
from
cumulative acknowledgments, a TCP sender could learn about only one lost
packet per-round-trip
time. An aggressive sender could choose to resend
packets early, but such re-sent segments might
have already been successfully
received. The TCP selective acknowledgment mechanism helps
improve
performance. The receiving TCP host returns selective acknowledgment packets to
the
sender, informing the sender of data that has been received. In other
words, the receiver can
acknowledge packets received out of order. The sender
can then resend only missing data segments
(instead of everything since the
first missing packet). Prior to selective acknowledgment, if TCP lost
packets
4 and 7 out of an 8-packet window, TCP would receive acknowledgment of only
packets 1, 2,
and 3. Packets 4 through 8 would need to be re-sent. With
selective acknowledgment, TCP receives
acknowledgment of packets 1, 2, 3, 5,
6, and 8. Only packets 4 and 7 must be re-sent. TCP selective
acknowledgment
is used only when multiple packets are dropped within one TCP window. There
is
no performance impact when the feature is enabled but not used. Use the ip
tcp selective-ack
command in global configuration mode to enable TCP
selective acknowledgment.
Refer to RFC 2018 for more details about TCP
selective acknowledgment.
NO.8 A GRE tunnel is down with the error
message %TUN-5-RECURDOWN:
Tunnel0 temporarily disabled due to recursive
routing error.
Which two options describe possible causes of the error?
(Choose two.)
A. Incorrect destination IP addresses are configured on the
tunnel.
B. There is link flapping on the tunnel.
C. There is instability
in the network due to route flapping.
D. The tunnel mode and tunnel IP
address are misconfigured.
E. The tunnel destination is being routed out of
the tunnel interface.
Answer: C,E
Cisco exam
fragen 400-101 400-101
Prüfungsfragen 400-101
prüfungenExplanation:
The %TUN-5-RECURDOWN: Tunnel0 temporarily
disabled due to recursive routing error message
means that the generic
routing encapsulation (GRE) tunnel router has discovered a recursive
routing
problem. This condition is usually due to one of these
causes:
Reference.
http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-
routingprotocol-eigrp/22327-gre-flap.html
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Exam
Code: 400-101
Prüfungsname: CCIE Routing and Switching Written Exam
v5.0
Aktulisiert: 16-08-2015, 400-101 testantworten
Nummer: 747
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