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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What two IOS software components are involved in TCAM operation?
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Feature Manager (FM) and Switching Database Manager (SDM)
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate

2. What is the maximum cabling distance for 10GBASE-SR/SW?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Route caching and topology based
Switch#show interfaces status
With a mask value in addition to binary values to decide which keys in a table are relevant

3. Displays error-disabled detection status
Static access or trunk
American National Standards Institute
Switch#show errdisable detect
Switch(config)#errdisable detect cause arp-inspection

4. What is EMI?
Switch(config)#errdisable detect cause udld
Electromagnetic Interference
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter
Switch(config-if)#no ip route-cache cef

5. Enables error-disable for errors when assigning a port to a dynamic VLAN through a VMPS
Switch(config)#errdisable detect cause pagp-flap
Switched virtual interface (SVI)
Switch(config)#errdisable detect cause vmps
The Null adjacency

6. What is the maximum cabling distance for 1000BASE-CX?
Layer 3 routing information builds and pre-populates a single database of the entire network topology; All table lookups are performed in hardware with the longest matching destination used in forwarding
Switch(config-if)#duplex {auto | full | half}
25 metres
Forwarding Information Base

7. What information is recorded in CAM as frames arrive on a switch port?
Collision domain
Source MAC address; Port of arrival; VLAN; Time stamp
Switch(config)#errdisable detect cause link-flap
Switch(config)#errdisable detect cause rootguard

8. Removes entries from the CAM table
Switch(config)#errdisable detect cause channel-misconfig
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch(config)#errdisable detect cause pagp-flap
Switch#clear mac address-table [dynamic] [address {mac-address}] [interface {interface}] [vlan {vlan}]

9. What is the content of TCAM Mask entries?

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10. What is the TCAM Value and Mask for an Ethernet access list?
Security and QoS ACLs
Source MAC (/48); Destination MAC (/48); Ethertype (/16)
Collision domain
Switch#show running-config interface {interface}

11. What technology was merged into the IEEE 802.3 Ethernet standard to create Gigabit Ethernet?
300 seconds
Switch(config)#errdisable detect cause dhcp-rate-limit
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
ANSI X3T11 FibreChannel

12. What is the original standard for Ethernet (10 Mbps)?
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
IEEE 802.3
Mask bits set to 1 for Value bits of interest and 0 for Value bits that don't matter

13. What is the name of a Layer 3 physical interface on a switch?
Interconnecting switches in a campus network
10 km
Native routed interface
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

14. What is the name of physical network segment where data packets can collide with one another when being sent?
10 Gigabit Ethernet over copper CX4 with Infiniband connectors
XENPAK - X2 - or SFP+
10 km
Collision domain

15. When can a switch start to learn source MAC addresses on incoming ports?
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Down - static access - trunk or tunnel
Institute of Electrical and Electronics Engineers
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

16. Adds a static entry to the MAC address table
LC - MT-RJ or RJ-45
SVI or native routed interface
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

17. What are the Gigabit Ethernet autonegotiation selection priorities?
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
40 km
Gigabit Ethernet over 1 pair 8 or 9 micron SMF (1550 nm laser)
1000BASE-T full duplex followed by 1000BASE-T half duplex

18. What is 1000BASE-LX/LH?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF or 9 micron SMF (1300 nm laser)
Switch#show errdisable detect
IEEE 802.3z
They are dropped (ARP throttling)

19. Displays the CAM table size with number of MAC addresses
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Switch#show mac address-table count [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#errdisable detect cause psecure-violation
In parallel revealing the best (longest) match in a single table lookup

20. What is the TCAM Value and Mask for an ICMP access list?
Switch(config)#errdisable detect cause gbic-invalid
300 seconds
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

21. Displays entries in the Forwarding Information Base (FIB) for a specific interface
Switch#show ip cef {interface} [detail]
ANSI X3T11 FibreChannel
Accelerated CEF (aCEF)
Interconnecting with existing Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) networks

22. Enables error-disable for Bridge Protocol Data Units (BPDU) received on ports configured for STP PortFast
Switch#show interfaces status err-disabled
Down - static access - trunk or tunnel
Switched virtual interface (SVI)
Switch(config)#errdisable detect cause bpduguard

23. What is the administrative mode of a switch port that carries transparent Layer 2 VPNs?
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)
Tunnel
The Drop adjacency
American National Standards Institute

24. What portion of the FIB contains the Layer 3 next-hop addresses for each entry together with the corresponding Layer 2 information?
The adjacency table
The CEF epoch number
Full duplex
Switch(config-if)#shutdown

25. What are the basic operations that a frame undergoes as it passes through a multilayer switch?
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Security and QoS ACLs
Static access - trunk - tunnel or dynamic

26. How is the TCAM organised?
The CEF epoch number
By Mask/Value - where each unique mask has eight value patterns associated with it
Feature Manager (FM) and Switching Database Manager (SDM)
With a mask value in addition to binary values to decide which keys in a table are relevant

27. Configures the maximum ageing time for entries in the MAC address table
Switch#show interfaces status err-disabled
With a mask value in addition to binary values to decide which keys in a table are relevant
15 metres
Switch(config)#mac address-table aging-time {seconds}

28. What is the default duplex mode of a 10 Mbps Ethernet interface?
Half duplex
10 km
Switch(config-if)#no ip route-cache cef
Switch(config)#no ip cef

29. Enables error-disable for errors with Layer 2 Protocol Tunnelling
300 seconds
Switch(config)#errdisable detect cause l2ptguard
Switch(config)#errdisable detect cause {all | {cause-name}}
CEF punt

30. What CEF optimisation replicates the entire FIB table among switch line cards?
10GbE operates only at full duplex
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Distributed CEF (dCEF)
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

31. What connectors can be used with SFP modules?
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
S = Short; L = Long; E = Extra-long
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]
LC - MT-RJ or RJ-45

32. What is CEF?
ANSI X3T11 FibreChannel
Switch#show adjacency [{interface}] [summary | detail]
Institute of Electrical and Electronics Engineers
Cisco Express Forwarding

33. What is the administrative mode of a switch port that uses DTP to negotiate its operational mode?
IEEE 802.3
10 Gigabit Ethernet over 50 or 62.5 micron MMF or 9 micron SMF (1300 nm WWDM laser)
Dynamic
CEF punt

34. How are MAC addresses shown in the detailed output from the CEF adjacency table?
Switch#show cef drop
Slow response times - low throughput - runts and other input errors on the switch ports
10 km
Adjacent MAC address (6 octets); Layer 3 engine MAC address (6 octets); EtherType (2 octets)

35. What function is performed by the Switching Database Manager (SDM)?
Institute of Electrical and Electronics Engineers
Partition and tune the TCAM on some Catalyst switches into areas for different functions
On
Switch#show mac address-table static [address {mac-address}] [interface {interface}] [vlan {vlan}]

36. When are mode-conditioning patch leads required with 1000BASE-LX/LH transceivers?
When one station transmits at the same time as another on a shared medium
The Punt adjacency
10 km
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)

37. What is 1000BASE-T?
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)
Down - static access - trunk or tunnel
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure
Gigabit Ethernet over 4 pairs EIA/TIA Category 5 UTP

38. What is CSMA/CD?
300 seconds
Switch#show interfaces {interface}
Partition and tune the TCAM on some Catalyst switches into areas for different functions
Carrier Sense Multiple Access Collision Detection

39. What is error-disable state?
Trunk
A switch port that has been shut down automatically due to a serious error condition
Switched virtual interface (SVI)
Full duplex only

40. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
IEEE 802.3ab
CEF punt
The Layer 3 engine

41. What is an interface-range macro?
Switch#show interfaces status err-disabled
A name assigned to a ranges of interfaces
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Switch#show running-config interface {interface}

42. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
Full duplex only
Switch(config)#mac address-table aging-time {seconds}
Half duplex
The switch port falls back to default setting of half duplex

43. What is 10GBASE-X?
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Cabling specifications for 10 Gigabit Ethernet
The adjacency table
Layer 2 source and destination MAC addresses; Layer 3 Time-To-Live (TTL) value and header checksum

44. What are the names of the two basic generations of MLS?
Route caching and topology based
Switch#show interfaces {interface} switchport
Tunnel
Creating the VLAN

45. What are the common cabling specifications for Fast Ethernet?
CEF punt
Trunk or dynamic
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Accelerated CEF (aCEF)

46. What is the content of TCAM Result entries?
IEEE 802.3z
Packets that have been truncated before they were fully received
Numeric values that represent what action to take after the TCAM lookup occurs
CEF glean

47. What are the administrative modes of Layer 2 switched interfaces?
Cabling specifications for 10 Gigabit Ethernet
Static access - trunk - tunnel or dynamic
A name assigned to a ranges of interfaces
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)

48. Selects multiple switch port interfaces at the same time and enters interface configuration mode
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
40 km
Switch(config)#errdisable detect cause ilpower
IEEE 802.3z

49. What is the maximum cabling distance for 10GBASE-CX4?
Source IP (/32) - Destination IP (/32) - Protocol (/16) - IP ToS (/8) - Source port (/16) - Source operator (/4) - Destination port (/16) - Destination operator (/4)
15 metres
IEEE 802.3
1 -2 on one end with 3 -6 on the other end - and 4 -5 on one end with 7 -8 on the other end

50. How are ports that are in error-disable state re-enabled by default?
Manually by administratively disabling and re-enabling the port
400 metres half duplex and 2000 metres full duplex
Static access
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]