300-410 Route Maps and Route Filtering Practice Test 4 — 15 Questions

Question 1

A network engineer runs the following command to troubleshoot redistribution with route-maps:

R1# show ip route summary

IP routing table name: Default-IP-Routing-Table(0)
IP routing table maximum-paths: 32
Route Source    Networks    Subnets    Replicates    Overhead    Memory (bytes)
connected       0           3          0             0           480
static          0           0          0             0           0
ospf 1          2           5          0             0           1280
eigrp 100       1           2          0             0           640
bgp 65000       0           0          0             0           0
  internal      2                                    
Total           3           10         0             0           2400

What does this output indicate?

Accepted Answer

BGP is not receiving any routes, possibly due to filtering.. The output shows a summary of the IP routing table, listing the number of networks and subnets from each routing source. It indicates that OSPF and EIGRP are contributing routes, while BGP has no routes.

Answer

EIGRP is redistributing routes into OSPF.

Answer

The router has a total of 13 routes.

Question 2

A network engineer runs the following command to verify MPLS LDP route filtering:

R1# show mpls ldp bindings 192.168.10.0 255.255.255.0
  lib entry: 192.168.10.0/24, rev 6
    local binding:  label: 21
    remote binding: lsr: 2.2.2.2:0, label: 22
    remote binding: lsr: 3.3.3.3:0, label: 23

What does this output indicate?

Accepted Answer

The prefix 192.168.10.0/24 has a local label of 21 and remote labels from two neighbors.. The output shows the MPLS LDP label bindings for prefix 192.168.10.0/24. The local label is 21, and remote labels from two LSRs (2.2.2.2 and 3.3.3.3) are 22 and 23 respectively. This indicates that the prefix is known in the MPLS network and labels have been assigned.

Answer

The prefix 192.168.10.0/24 is being filtered by a route-map.

Answer

The LDP session with 2.2.2.2 is down.

Answer

The prefix 192.168.10.0/24 is not in the routing table.

Question 3

A network engineer runs the following command to troubleshoot DMVPN with NHRP filtering:

R1# show ip nhrp detail
10.1.1.2/8 via 10.1.1.2, Tunnel0 created 00:10:00, expire 01:50:00
  Type: dynamic, Flags: authoritative unique registered
  NBMA address: 192.168.1.2
  (no-socket)
  (no-socket)

What does this output indicate?

Accepted Answer

The spoke at 10.1.1.2 has registered with the hub and is reachable via NBMA address 192.168.1.2.. The output shows an NHRP cache entry for a remote spoke (10.1.1.2) with NBMA address 192.168.1.2. The entry is dynamic and registered, indicating that the spoke has successfully registered with the hub.

Answer

The spoke is being filtered by an NHRP filter.

Answer

The NHRP entry is static and configured manually.

Answer

The spoke is not reachable because the NBMA address is incorrect.

Question 4

A network engineer runs the following command to troubleshoot IPsec with route-maps:

R1# show crypto ipsec transform-set
Transform set combined: { esp-aes 256 esp-sha-hmac }
   will negotiate = { Transport, }

Transform set ESP-AES: { esp-aes 256 esp-sha-hmac }
   will negotiate = { Tunnel, }

What does this output indicate?

Accepted Answer

There are two transform sets configured, one using transport mode and one using tunnel mode.. The output shows two IPsec transform sets: 'combined' and 'ESP-AES'. The 'combined' set uses transport mode, while 'ESP-AES' uses tunnel mode. This indicates that different transform sets are configured for different purposes.

Answer

The transform set 'combined' is not valid.

Answer

IPsec is not configured because no transform set is active.

Answer

The transform set 'ESP-AES' is used for route-map filtering.

Question 5

A network engineer runs the following command to verify CoPP (Control Plane Policing) with route-maps:

R1# show policy-map control-plane input class class-default

Control Plane

Service-policy input: CoPP

Class-map: class-default (match-any)
      12234 packets, 1234567 bytes
      5 minute offered rate 1000 bps, drop rate 0 bps
      Match: any
      police:
          cir 8000 bps, bc 1500 bytes, be 1500 bytes
        conformed 12234 packets, 1234567 bytes; actions:
          transmit
        exceeded 0 packets, 0 bytes; actions:
          drop
        violated 0 packets, 0 bytes; actions:
          drop

What does this output indicate?

Accepted Answer

The CoPP policy is allowing all traffic and not dropping any packets.. The output shows the CoPP policy applied to the control plane. The class-default matches all traffic and polices it at 8000 bps. All packets have conformed and been transmitted, with no drops. This indicates that the CoPP policy is working and not dropping any traffic.

Answer

The CoPP policy is dropping all traffic because the CIR is too low.

Answer

The CoPP policy is only matching specific traffic classes.

Answer

The CoPP policy is not applied to the control plane.

Question 6

In Cisco IOS-XE, what is the default behavior of the 'route-map' command when no 'match' or 'set' clauses are configured?

Accepted Answer

It permits all routes and applies no changes.. A route-map without any match or set clauses is a permit statement that matches all routes and performs no modifications. This is a common source of unintended route filtering.

Answer

It denies all routes by default.

Answer

It permits all routes and sets the metric to 0.

Answer

It denies all routes and logs the action.

Question 7

What is the default administrative distance for routes learned via OSPF in Cisco IOS?

Accepted Answer

110. OSPF has a default administrative distance of 110, as defined in Cisco IOS. This is used for route selection when multiple routing protocols provide the same prefix.

Answer

90

Answer

100

Answer

120

Question 8

Which BGP attribute is used as the first tie-breaker in the route selection process when comparing routes from different peers?

Accepted Answer

Weight. The BGP best-path selection algorithm first prefers the path with the highest weight (Cisco proprietary), then highest local preference, then locally originated routes.

Answer

Local preference

Answer

AS path length

Answer

MED

Question 9

In OSPF, what is the default hello interval on a point-to-point network type?

Accepted Answer

10 seconds. OSPF default hello interval is 10 seconds for broadcast and point-to-point networks, and 30 seconds for NBMA networks. This is defined in RFC 2328.

Answer

30 seconds

Answer

5 seconds

Answer

40 seconds

Question 10

What is the default maximum number of paths that BGP can install in the routing table using the 'maximum-paths' command in Cisco IOS?

Accepted Answer

1. By default, BGP installs only one best path (maximum-paths 1). This can be increased to allow load balancing, but the default is 1.

Answer

2

Answer

4

Answer

6

Question 11

Which statement correctly describes the behavior of the 'set metric' command in a route-map when applied to redistributed routes into OSPF?

Accepted Answer

It sets the OSPF metric to a value between 1 and 65535, with a default of 20.. When redistributing into OSPF, the 'set metric' command sets the metric type and value. The default metric type is E2 (external type 2), and the default metric value is 20.

Answer

It sets the OSPF metric to a value between 1 and 65535, with a default of 10.

Answer

It sets the OSPF metric to a value between 1 and 16777215, with a default of 20.

Answer

It sets the OSPF metric to a value between 1 and 255, with a default of 1.

Question 12

In EIGRP, what is the default hello timer on a point-to-point interface?

Accepted Answer

5 seconds. EIGRP uses a default hello interval of 5 seconds on high-speed interfaces (including point-to-point) and 60 seconds on low-speed NBMA interfaces (T1 or slower).

Answer

10 seconds

Answer

15 seconds

Answer

60 seconds

Question 13

What is the default maximum hop count for RIP routes in Cisco IOS?

Accepted Answer

15. RIP uses a hop count metric with a maximum of 15 hops; 16 indicates an unreachable route. This is a fundamental loop prevention mechanism.

Answer

16

Answer

255

Answer

10

Question 14

Which BGP attribute is considered 'well-known mandatory' and must be present in all BGP update messages?

Accepted Answer

AS_PATH. The AS_PATH attribute is well-known mandatory, meaning it must be included in all BGP updates. Other well-known mandatory attributes include NEXT_HOP and ORIGIN.

Answer

LOCAL_PREF

Answer

MED

Answer

COMMUNITY

Question 15

Drag and drop the steps to apply a route-map to filter BGP prefix advertisements into the correct order, from first to last.

Accepted Answer

Define route-map with permit/deny and match conditions. First, define the route-map with a permit or deny clause and match criteria. Second, configure the set actions to modify attributes. Third, apply the route-map to the BGP neighbor using the neighbor route-map command. Fourth, clear the BGP session to activate the filter. Finally, verify the filtered prefixes using show ip bgp.