400-101 Free Questions – CCIE Routing and Switching Written Exam V48.02

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400-101 Free Questions – CCIE Routing and Switching Written Exam V48.02

1. Which statement describes the operation of the Generalized TTL Security Mechanism (GTSM), used by routing protocols to prevent some type of attack?

An MD5 hash of the received TTL, source IP, destination IP, protocol, and shared key must match

The TTL in a received packet must be a low value (typically 1 – 2)

The TTL in a received packet must be a high value (typically 254 – 255)

Both end systems compute an MD5 hash based on the TTL and a shared secrete If the received and local value differ, the packet is dropped

2. Which three values are used to generate a unique bridge ID for each VLAN in PVST+? (Choose three)

port cost

max age

spanning-tree MAC address

port priority

switch priority

extended system ID

3. Which method can an IPv6 host use to learn the RP in an IPv6 multicast-enabled network?

It uses Auto-RP

It receives it as part of the DHCP scope

It receives an advertisement through MGBP

It extracts it from the multicast address

4. Which three components are in an MPLS header? (Choose three)

a 4-bit experimental use field

a 4-bit label stack entry

an 8-bit TTL

a 2-bottom of stack

a 3-bit experimental use field

a 20-bit label

5. Ping and Trace route extended options are very useful.
Which difference between using the Record option with the ping command vs the traceroute command is true?

The record option is not supported with the traceroute command

When leveraged with the ping command the Record option of this command not only informs you of the hops that the echo request (ping) went through to get to the destination but it also informs you of the hops it visited on the return path

The record option is not supported with the ping command

When leveraged with the traceroute command, the Record option of this command not only informs you of the hops that the echo request (ping) went through to get to the destination, but it also informs you of the hops it visited on the return path

6. Which prefix list matches and permits all RFC 1918 network 10 0 0 0 routes that have masks of /16 through /24?

ip prefix-list foo seq 10 permit 10 0 0 0/16 le 24

ip prefix-list foo seq 10 permit 10 0 0 0/8 ge 15 le 25

ip prefix-list foo seq 10 permit 10 0 0 0/16 ge 15 le 25

ip prefix-list foo seq 10 permit 10 0 0 0/8 ge 16 le 24

7. Which Cisco PfR monitoring mode is recommended for Internet edge deployments?

active mode

fast mode

active throughput mode

passive mode

8. Which mechanism does GET VPN use to preserve ip header information?

GRE

MPLS

IPsec transport mode

IPsec tunnel mode

9. Which neighbor-discovery message type is used to verify connectivity to a neighbor when the link-layer address of the neighbor is known?

neighbor solicitation

neighbor advertisement

router advertisement

router solicitation

10. Which two statements about IPv6 6to4 tunnels are true? (Choose two)

Sites use addresses from the 2002::/16 prefix

Sites use addresses from link-local scope

They are point-to-multipoint tunnels

They are point-to-point tunnels

They rely on GRE encapsulation

11. Which statement correctly describes Ansible operations and playbooks?

Ansible is agent-based and uses playbooks formatted in YAML

Ansible is agentless and uses playbooks formatted in YAML

Ansible is agentless and uses playbooks formatted in XML

Ansible is agent-based and uses playbooks formatted in XML

12. Which two BGP attributes are optional, non-transitive attributes? (Choose two)

AS path

local preference

MED

weight

cluster list

13. Which two statements about VTPv3 are true? (Choose two)

Extended VLANs prevent VTPv3 switches from becoming VTPv2

VTPv3 must receive VTPv2 packets before it can send VTPv2 packets

VTPv3 accepts configuration information only from VTPv2 devices

VTPv3 sends VTPv2 packets when they are detected on a trunk port

VTPv3 regions can communicate in server mode only over a VTPv2 region

14. Which two features are incompatible with Loop Guard on a port? (Choose two)

BackboneFast

BPDU skew detection

UplinkFast

PortFast

Root Guard

15. In an MPLS-VPN environment, what is the effect of configuring an identical set of route targets for a particular VRF but then configuring nonidentical RD accross multiple PE devices?

The routes are rejected by remote PE because they have a different RD than its routes

The routes propagate to the remore PE, but the PE never installs them in its forwarding table

The routes are correctly managed by the control plane, but there are instances where routes take up twice as much memory

The routes are not sent to any remote PE with a differnt RD

16. In which 802 1D port state are the root bridge, the root port, and the designated ports(s) elected?

Listening

disabled

learning

forwarding

blocking

17. Which two statements about IS-IS authentication are true? (Choose two)

if LSP authentication is in use, unauthorized devices can be form neighbor adjacencies

Area and domain authentication must be configured on a per-interface basis

Passwords can be configured on a per-interface basis

Level 1 LSPs use the domain password

Level 2 LSPs use the domain password encrypted inside the IS-IS PDU

18. Which two factors contribute to traffic starvation when TCP and UDP flows are included in a single traffic class? (Choose two)

UDP flows maintain a consistent transmission rate when congestion occurs on a link

TCP flows continually reduce the window size when congestion occurs on a link

UDP flows continually lower their transmission rates when congestion is detected

TCP flows maintain a consistent transmission rate when congestion occurs on a link

TCP flows continually lower their transmission rates when congestion occurs on a link

UDP flows continually reduce the window size when congestion occurs on a link

19. Which two OSPF network types require the use of a DR and BDR? (Choose two)

non-broadcast networks

point-to-point networks

point-to-multipoint networks

broadcast networks

point-to-multipoint non-broadcast networks

20. An IPv6 network has different MTUs on different segments If the network is experiencing reliability issues, which option is the most likely reason?

The MTU size is greater than 1470 bytes

The Do Not Fragment bit is marked

ICMPv6 is filtered

HSRPv6 is configured incorrectly

21. In which way does the Bridge Assurance mechanism modify the default spanning-tree behavior in effort to prevent bridging loops?

BPDUs are sent bidirectional on all active network ports, including blocked and alternate ports

Extended topology information is encoded into all BPDUs

If BPDUs are no longer received on a port, the switch immediately sends out a TCN BPDU

Received BPDUs are looped back toward the sender to ensure that the link is bidirectional

22. For which feature is the address family “rtf0ilter” used?

Route Target Constraint

Enhanced Route Refresh

Unified MPLS

MPLS VPN filtering

23. Which two statements about Cisco IOS XE are true? (Choose two)

It is deployed in a Linux-based environment

Separate images are required for platform-dependent code

It uses a service blade outside Cisco IOS XE to integrate and run applications

The FED feature provides separation between the control plane and the data plane

Its functions run as multiple separate processes in the OS

24. Which two statements about route summarization are true?

It can be disabled in RIP, RIPv2, and EIGRP

EIGRP and RIPv2 route summarization are configured with the ip summary-address command under the route process

EIGRP can summarize routes at the classful network boundary

RIPv2 can summarize routes beyond the classful network boundary

25. Which method can an IPv6 host use to learn the RP in an IPv6 multicast-enabled network?

It uses Auto-RP

It receives it as part of the DHCP scope

It receives an advertisement through MGBP

It extracts it from the multicast address

400-101 Free Questions – CCIE Routing and Switching Written Exam V48.02

400-101 Free Questions – CCIE Routing and Switching Written Exam V48.02

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